Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab214128e277fc1…

MALICIOUS

PDF

88.2 KB Created: 2021-09-07 10:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 50686178218b29e855d898ff61986d7e SHA-1: 0d29f422b5e36768fd628424cffa9ab03969e592 SHA-256: 3ab214128e277fc10b3324b38479bb6ecca3d35d4ae187e03dc1df919e76ee11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it's intended to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://strap.sk/uploads/files/kazokuxodubukobi.pdf In PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/kc5c9fr62k8ebcopron7cpssfr/94234055032.pdfIn PDF document text
    • http://guitarenko.fr/img/files/zitetilos.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/xukibibuwutemetifekimiz.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/lumirasokamowoku.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/rosuzizibotakod.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1611bbcdba76db---zosemejuwisejetorawif.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/voxerubogibanowalibi.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075766711591---zamuzowo.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eb09e24d9---gobagubovogusum.pdfIn PDF document text
    • https://birutelorasin.com/contents//files/4349408554.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/pugugaxufisaboxivufezawup.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/befusenukinufa.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39684994882.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a781d393e51---36502344468.pdfIn PDF document text
    • https://funke.be/data/file/20826438189.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/73629165071.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/345099e034c79d3ff4461b5e592a7f7f/20520193946.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/jaxog.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/lanukukatugozaxajati.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/15662200775.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/2820c1014dbe234296de834a1371a55a/ralebajevireluw.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ls5a7t8ci9b7058mq3souobreq/bowovewusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=anxiety+disorder+pdf+booksPDF 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_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 10712 bytes
SHA-256: dc021b74c9770066873aa68989dfab4a2c59a494f55784851b11d37613385625
font_01_sfnt_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 17500 bytes
SHA-256: 5ac06dd23c45118f4c2e61ac3c51792b4623b8823d8eeca5ff8231e67696769d
font_02_sfnt_off00013b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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