Malicious PDF — malware analysis report

Static analysis result for SHA-256 90effde95cf7a4d0…

MALICIOUS

PDF

78.0 KB Created: 2021-07-18 19:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d12bb9ced89592d8f1df106ab729aa2 SHA-1: 0a09c65fb9ae9bdc9a68aa96f1e0f4f305ad9ff2 SHA-256: 90effde95cf7a4d0a1e2d8c11de0abbd87f11bbbe90b3df35ce89341c467e18e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to delivering a payload or redirecting to a malicious site. No scripts were extracted, but the extensive link farm is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d12ee15c9a---noxiragarigijefedonatari.pdf In PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608129e3d8717---kabixuga.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/87586327417.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3dba4c25d---37863344430.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/5c848qsonr2otk85hjhnqonidj/lufemoxomakulu.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/qj9gr1ktuhj6usklk1ae5jhq21/94309386791.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b55168ac1e9---zapidadutasufuguzotekaxi.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2da985e4e---69969126515.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///rakavananeruwoporewezig.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/77003157987.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bca81650c5---gawuronozunafusapasi.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/76680248509.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/b2079109562df43b1835927b939d51ed/93517063263.pdfIn PDF document text
    • https://caffedisanto.it/file/jizirixaw.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607284d1e6074---94907852624.pdfPDF link annotation
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607281b38f424---9261594054.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/93028735400.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/8cef2c4aa183fe8c01729ed0973878ed/delolelegotizoduku.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f1d48d5b5---17231002214.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/67870931607.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f4ca40189---zavofoxodinoxewo.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/23973487938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=5+star+hotels+in+viequesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4A 17776 bytes
SHA-256: e20bb7eb6aaac878dc3e6f96f89b049940439c24fc0a837d3ef7d092a1f94b3d
font_01_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D7 10556 bytes
SHA-256: f75582d8d9e562e627778d00429debc04eabab172dcf6cf428a59121c533f3b6

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