Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdf4f213b9bed5e…

MALICIOUS

PDF

86.8 KB Created: 2021-07-07 16:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a8ce062c17277b1c80a9250c863b379 SHA-1: 27a2e0df2238c44b792b080433b10ef566fed463 SHA-256: 6fdf4f213b9bed5e5776157e9fa5ec8be9debc44b158ad602232ad40cdb1a88b
176 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 platforms or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://allytemp.ru/uplcv?utm_term=red+wine+braised+short+ribs+slow+cooker
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1b0j19tsfc6jaq9nb9pi1rvrm1/duzuromimadiwarel.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706493073c3---vowinidodoxumes.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/55745773858.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/2dkei3h6oe0qd76v8jlsa9f042/togonitapevijinupubij.pdf
    • https://seeandhearbetter.ie/img/shop//contents/pimekinejafurupuf.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/icfqj59tgrfj6jnps293mgq4j0/logafafovimuxilutuwik.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/f825fe5f3vr0cdmdueqnb1g1t0/ritafarugizuxune.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160716f780f049---87064681992.pdf
    • http://vandientuchinhhang.com/upload/files/muxagubakugobow.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210602201636.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/kuxutoberapevanaxaxumoka.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e9aedbe177fbba2e99c9b1bb84935db8/lavipuwokesesofokebixujo.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/35aedd7eabc071d536654f99fd72fc04/josola.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082de8ba1436---1448089796.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609939d836cd4---69625885320.pdf
    • http://donateagift.eu/userfiles/file/81687074245.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/oio9qo2g6fd4m6o17mq8n89fj2/49083781023.pdf
    • http://gelikonline.ru/content/Files/telinimanujitemaz.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/j9gmfn30ck9sjreqtgr5jnfd12/5836011675.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092790ccb363---benuxobagilotupita.pdf
    • http://optimaglobal.net/ckupload/files/60324071390.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/7b0b92ff9ea2f1ddb3b3ba0b4f7a5e5a/54941967089.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2bff1163b---14694467496.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/72107184195.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c6f098522---89726903516.pdf
    • 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_off0000efb9.bin
355f3f5a07a316b12a9f2887807bb3f59e84835140458b3a3826198fdfbda0b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 17424 bytes
font_01_sfnt_off00011cc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 16792 bytes
font_02_sfnt_off000134de.bin
2397dabf622ee2d9b4ade8081bc305da7654ddad890a3676c5b3332ded010dac
pdf-font-stream PDF embedded font (sfnt) at offset 0x134DE 10832 bytes