Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f9109f0b1e1b0e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 11:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: faad353e9a415922523a487c2dfd43ba SHA-1: 7ca61152e63a6d8e3fdf56457ed395d348ca7b6c SHA-256: 71f9109f0b1e1b0e8eebcf123d5b9b36d791f4fa2c0def37002bef2f8f84a4eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://www.autopsrus.com/ckfinder/userfiles/files/janaxinetud.pdf In PDF document text
    • https://lecachet.fr/docs/files/gebapojugukotuviwagatop.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mofujamepinolip.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63488444447.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/zetatakubutewogaf.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/vunavozesonurisevewow.pdfIn PDF document text
    • https://castel.ro/userfiles/file/jaxizigesatapogolebu.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/74163066117.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/zarirowipef.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/vapezofi.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/9454856404.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b050260fcc9---70226382815.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/94127678912.pdfIn PDF document text
    • https://luminex.pl/upload/file/zevofipakexeke.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/966a4880797c44aa5a664d8e4b57ff0d/16132441948.pdfIn PDF document text
    • https://digireg.com/upload/49473947261.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160800729532ec---70762530248.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/50930225695.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/51318521079.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/86534006520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=create+non+copyable+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_off0000d0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CE 18864 bytes
SHA-256: 8593c8505b232184069d1d179ee4c1640b038367ba24e65a5ec3bed35586063e
font_01_sfnt_off0001025e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A75 10640 bytes
SHA-256: 70f44f18d63b0b37878eff7af4a8df597be0c72d8219a06c6aaa6eb28952ed77