Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c7d9c266cc9858…

MALICIOUS

PDF

88.9 KB Created: 2021-07-31 00:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a5d690b04dc87ee1ae7be87538e6b90 SHA-1: 9746fa22401b4716cb7d60348e866f2e3a3405e3 SHA-256: b5c7d9c266cc98585973d67aeddd9b42902d05fb7381fe58162eac4d4d15e1cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://akamercedes.com/images/uploads/files/25837792292.pdf In PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/65506726098.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/q6vankahjicgme56ju5sje65lj/45569906637.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/lunifuzufarafat.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f5ca5ee30---pafugadegazomisawupusamos.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/92259660635.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/51970459379.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/dokuw.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e38cfb2f287c6813f2313207bd8fb667/zotokefarofide.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8ihvj24e9a05heaov6crjaivb7/xatalezased.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfe569acb1---12796769602.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a844284e0---83675177827.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b16add677---pewonusojadoxawabaz.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/rudemajil.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/c9abce40c24c166310e97ad260c2e8ea/daduxi.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/roxose.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0a3732b6---dukudalodojigamipesolor.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/nuruwulexegefiwisaruka.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/remaluboxozulukotagob.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/71147053052.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e8a10295ea7444b1ec2b85956e75972e/pagavajokilofomuvazapexom.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/senijuluje.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a76195199---rofizaselat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=phrasal+verbs+with+come+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_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 17956 bytes
SHA-256: 373923f41f48b0e84b4cbab4696d6638b947e13d98928c37a0054ae506ad2d64
font_01_sfnt_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 11076 bytes
SHA-256: a6dc9a3040c8e5fffefce4f3fa9d77eb1d63ed81d0491276d638d6c6e2adecda
font_02_sfnt_off00013b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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