Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e87a43c8c3116d…

MALICIOUS

PDF

106.8 KB Created: 2021-08-12 13:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c77231cb3929e3867f8a78f774baee81 SHA-1: 6061cd67eff34ead98eed2ef9441b99bfb71bf12 SHA-256: 21e87a43c8c3116d640c759b53a4bb2874560fd67f7def688fad9f47c17d8c81
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links pointing to compromised WordPress sites, suggesting it acts as a lure to download further malicious content or engage in phishing. The presence of raw IP address links and link farms on disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9677

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6793612a48---92185729125.pdf In PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a6a84718e---pojipunolima.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c122ea372ec---jutiwiwezupomeluvez.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937e15ad3cf---biweduwu.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/lipesuxabidexoj.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/sezipon.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/rijelubiruxagolura.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a27dca83c---95921922149.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/7s5cr43ukfdd02ecqijam8i7p9/37820758774.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/46860595786.pdfIn PDF document text
    • https://pindimana.in/uploads/file/fukevobiwola.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56b502338---15781576896.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a11d10248dc---rezumejupanogileladin.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/fagokukabilanoguzu.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/roliv.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ecc2d5364ab4a91ecb713442ecc97c6d/42089881662.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/sibanefoputekopuxolites.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc60e4ca256---63895985575.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160780ce0bd791---lezapagevisuwizodiwuz.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/fosatuxajoxugiwexi.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/61588014218.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/nolum.pdfIn PDF document text
    • http://wsm.hk/images/files/35013206753.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/95145519427.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/b808baca748c998ee5ed2baa5cc2a35d/52356558928.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bd3e13e20---69528195018.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160929e20bad7d---95634836790.pdfPDF link annotation
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dnd+5e+wild+magic+tablePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12923 10688 bytes
SHA-256: e6d9911c5060bbbe5527ec77b7143e8daf09dfb0889e7e7ef9f98418c6489951
font_01_sfnt_off00014189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14189 17136 bytes
SHA-256: a8ca503daee1ca7945dc18196cb4cc27fbe82b9d66a47e57704ebf0c8ec715dd
font_02_sfnt_off00016e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001869b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1869B 16456 bytes
SHA-256: b567351d8817b452d7c2fb9a0144519bfd530866bceb2805c1f9ef2299257e42

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