Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a6d9818c23d743…

MALICIOUS

PDF

70.0 KB Created: 2021-09-19 22:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb6331a925a546b90d5ae95e1a0b0d38 SHA-1: 950ea7b39703e6737f63055b4d7dd229154caeeb SHA-256: c9a6d9818c23d743928a89b18e434795369f1626d629d6b5828f424dfc569a7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, 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 PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/73f99171bfb068f138ea86b48cfd87a4/69543026782.pdf In PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/44197676300.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/juvuke.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/8251168811.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/ledomoletefadumum.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/68205754431.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/97906115152.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/basakamurotavumu.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/57923998176.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/xerotivikurefi.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/mijinububutisudorejudizu.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/58824407652.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f000e01519a8c8be44cbdcc69ef80264/sumuwelexaxutunogaruwolif.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4b54d8e46---70211962657.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d4eca96f58b87ba3e5c82662f33f707c/sawufimil.pdfIn PDF document text
    • http://ministerium.pt/files/jefexi.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/zaromitebibakokojagun.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/bozomemuxalolaz.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a766e4b1---33740364988.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/fogefivabipugu.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c0db31ba93e1d62fe01a16515b6754b8/nenilutinisolamalof.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/56007471729.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/86130825633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=watch+anime+stream+onlinePDF 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_off0000b611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB611 14584 bytes
SHA-256: 5c75c31f1aa83f14c93a98d1df0c4fb1a17b72fd2cb2a40fcd8d5edb61a2d90f
font_01_sfnt_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 10488 bytes
SHA-256: b22a11dec35a59de86e4e3c0741ad6d2364060f6b70cd5d2a1dcbc11d7d8f68a
font_02_sfnt_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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