Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3c8cdcf9e440cb…

MALICIOUS

PDF

73.2 KB Created: 2021-09-27 12:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04413a141d5dd15f9aad7aba35171524 SHA-1: 70a796a0ed72990e48bcb3be2d076b655d29f930 SHA-256: 3a3c8cdcf9e440cb92e69dc15e3ef900aa391a7d7ef308c3e5aa82e799d1eede
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the document functions as a link farm, directing users to various domains, some of which are hosted on compromised CMS platforms. The embedded URLs, despite some being marked benign, are part of a broader pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://paraleumarian.ro/app/webroot/files/userfiles/files/82720984387.pdf
    • https://lochoanggia.com/upload/files/17376980430.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/b35a4a2a967fee86365ccdba23361c3a/miwixarajoloki.pdf
    • http://fairfresh.net/assets/admin/ckeditorimage/files/68674433021.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1f53a2be---33986660120.pdf
    • https://pelletier-tp.fr/ckfinder/userfiles/files/zewuwikidatam.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4c5cf99e7cbf7f5abb6c0204e396b357/rarevedizopisumariranezu.pdf
    • http://unipsyclinic.com/userfiles/file/20210907220503.pdf
    • https://drivetripper.com/userfiles2020/files/1450941584.pdf
    • https://abctranslink.com/ckfinder/userfiles/files/912057568.pdf
    • http://rancholasmonturaspremios.com/campannas/file/48675659180.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/winumoneboz.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/nabipuzevirubatitafurofu.pdf
    • http://lt101shop.com/userfiles/files/28281412359.pdf
    • http://guidesdugrandlarge.fr/images/import/file/xutolemi.pdf
    • https://thefencedocumentary.com/adminfiles/file/jemudefuxazijesu.pdf
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/6486306716.pdf
    • https://5udua.com/contents/files/97948879455.pdf
    • http://gonganmi.com/userfiles/file/vazisasetodikegaxo.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/4e7755acda14c08493845dbc7aa5a897/zenepoge.pdf
    • http://srmtteaparty.com/uploads/files/202109151430058195.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/81324589082.pdf
    • http://papienbanana.com/user_file/file/tobubeninekaw.pdf
    • https://airxps.com/userfiles/files/daribugigekafini.pdf
    • https://repetitorebi.ge/userfiles/files/20170971060.pdf
    • http://epicridesnepal.com/files/wonelozerurerelafosariban.pdf
    • http://biomax.shop/filespath/files/20210913045143.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=instagram+ka+reels+video+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9b5.bin
c2e88d4008dccac17f17966bd40b7ec0699c20ef5ed70a8f969a0d57d2c68e43
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B5 10788 bytes
font_01_sfnt_off0000d25a.bin
4df8d692e5e91eb944e6d7347ab91214d56da45a3c9db42696eaef1dd6cc0abd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 16668 bytes
font_02_sfnt_off0000fcad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 16792 bytes