Malicious PDF — malware analysis report

Static analysis result for SHA-256 247868425bd425f7…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 22:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4db58c333d266192d883996f13ec0e9d SHA-1: b491e66c30c597671e17d92b1a34494577eafcfa SHA-256: 247868425bd425f7514aecead4633ef03e58b60754a87b31f5e48f1a90350d57
176 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which appear to be WordPress installations hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The document's structure as a link farm suggests an attempt to distribute malicious content through various compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94927557ea---sujusunozapaxinunax.pdf In PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ubqjjfjhutar9hjqrm2jcsiean/bipadapizowufi.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210814_4F00C608FE0093B0.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/5136c606310a099ec2ba9f95de13227e/82061411424.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8643e3375---tafeguxusevabawomufivoget.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/16039689914.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/rekode.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/1514930024.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c8c985ac---27863294371.pdfPDF link annotation
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/0b6bb124d6ac5a6499fbadb667827444/bekadajewadi.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/gemovogivesakorufoxuvevel.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/32223122821.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610a12bfc4f5e---gexewu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e5feb6f9---78824608880.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/vasab22nejq15upjfhjfdc68h7/bijasokutovozunoxezepu.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/93327913249.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160862bacce8fd---kixuvobofukutenajeliza.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e321075710---selelunajevogusu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b278f821ba---tilotapiniviwexiv.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/51064490388.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/64813660483.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/35206413527.pdfIn PDF document text
    • http://popmetre.com/news/files/73444399798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+many+cards+are+in+the+deckPDF 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_off0000db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 17388 bytes
SHA-256: 4e402900cc9b6ec31c14f53a33a322f8727f402ffef60d3a818e0f3267d75147
font_01_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 10872 bytes
SHA-256: 8aa9ef5231a63e28294b3a36e820f1a68b3f01c6131711dc82ff52d6f2c59780

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