Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8baf4c07a90eae…

MALICIOUS

PDF

80.8 KB Created: 2021-09-10 01:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3fe10e5a0cf8877caa5ec55890b2ed39 SHA-1: 6f0d469cea776579dcf5c669257b3e7b695f915b SHA-256: 3e8baf4c07a90eae26ef6392ec9187769ab75fa4b7ba2fd6390fffddfae0a1cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest it's likely a phishing or malware distribution attempt, possibly leveraging embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://isystemlab.com/admin/ckfinder/userfiles/files/67564791607.pdf In PDF document text
    • http://skncn.com/u/files/zefukakab.pdfIn PDF document text
    • http://sarna-zapiekanki.pl/ckfinder/userfiles/files/30552833748.pdfIn PDF document text
    • https://irantruck.ir/data/file/parikekuxavozebe.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/kedariruxanebogilaj.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/39781523382.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/givosem.pdfIn PDF document text
    • https://pr-dienst.ch/file/vujiwajov.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210906095905.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/womid.pdfIn PDF document text
    • http://sushibelovo.ru/files/zukari.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/62591621812.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/tuwodezumapi.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/levozekesedevitaw.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/iplaufa6i7e2s08faua9qitp75/14518794073.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613507895ad26---nafagusogurumu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/76647170411.pdfIn PDF document text
    • http://www.520amis.com/upload/files/wopafu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130f61d9952c---7842507912.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/41997731295.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a792487071---55068627480.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/44724385229.pdfIn PDF document text
    • http://mamadona.ru/ckfinder/userfiles/files/jofij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+studio+basics+pdfPDF 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_off0000d6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 17864 bytes
SHA-256: d460012e2c0fcd44cd9f4d1163342c60b1acad0b2de81247442b417eb5bdcc6b
font_02_sfnt_off00011d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 10656 bytes
SHA-256: 4f311921c7fb7b11b4823f55d2f4cddd63601aa531ff5d3c1d315178f7dee131

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