Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f169c8db167a97e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 17:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 76651a414966ece70b395955d418c5bc SHA-1: e1affe940f73ba7b41a94e7169a654d812504e03 SHA-256: 7f169c8db167a97e8c315c4390faf4fd42b6583ead4af2909067e917321dd0af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to facilitate downloads or redirects, aligning with T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://marlin-aquarium.ru/ckfinder/userfiles/files/4216765004.pdf In PDF document text
    • http://bantinnhadat.com/users/files/baxaf.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/22600592650.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/40899798889.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/86972797347.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/91995028241.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/segodexubuwobifisop.pdfIn PDF document text
    • https://bdata.vn/upload/files/kanilajulomijexa.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/nufadukifene.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/17873535144.pdfIn PDF document text
    • https://termoformat.md/img/files/84373810524.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/gigadesetemul.pdfIn PDF document text
    • http://www.depomatrial.com/file/41451538904.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335fee07b24---78369793676.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f29a6d8b6---195406307.pdfIn PDF document text
    • http://goref.ru/files/file/76840639042.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/48538963399.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51969790947.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/tefuwu.pdfIn PDF document text
    • http://ibb-online.ru/f/file/zufuwuluvazugepef.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/tonunujorotelekozamoj.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/89953285846.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/73683090575.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/r4m8iqfm1pdtaoco4c95k4smv2/24662914106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pokemon+silver+rom+cheat+codesPDF 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_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 10796 bytes
SHA-256: 3cf4b24a12d578a3c71f7a1839186c310ccc679908c5408f54fb73ce5e63301c
font_01_sfnt_off0000f66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E80 17452 bytes
SHA-256: 9e9a4201791a1f5a01c852290b3da3ebbe6fd7cb36bd02dfc48a680f8e2ebd2e

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