Malicious PDF — malware analysis report

Static analysis result for SHA-256 c771477c2550e09d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 09:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dde525e913acd99b65bf13af34c3b967 SHA-1: 2e07a3625812366a98316f52310ba903696b2187 SHA-256: c771477c2550e09d281815c1070c542cfbea8672cd7c2ac8c4d985c745e10253
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm pointing to compromised WordPress sites. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/83e2c2c6636c35e5b3fc9d853cd88c8f/85152266487.pdf In PDF document text
    • http://kiiga.ru/userfiles/file/mijujisasulomud.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/tokuro.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c2588305634358b70ae777c641e79524/32169036350.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a85ab6f65e9a56f9aa9539274333c3d6/buloju.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754bf87de8e---31924938966.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160735f47794c3---zapirelazuxoguvulakol.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb52f6509b---dolotafefapifexomulaxev.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/pipewibetera.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/93436101330.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/gifosoxetunonejigejuneri.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/dotuxokizobuxegowiw.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/45603208413.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/zisomixawomudotebokaxulu.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/mojomip.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d83863ab747d34ffb073c8bbf24f18da/19444947071.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c6b970e762adb9d1cdbf943dbeb36220/27644763648.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/putosotidirabojixirapado.pdfIn PDF document text
    • http://airfa.it/userfiles/file/8449341854.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/regasaru.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/9453433430.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/lekikevuwelovozopoguxesov.pdfIn PDF document text
    • http://prestopc.it/upload/file/tugositaxojixa.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16204774334029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=antrag+wohngeld+sachsen+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 18464 bytes
SHA-256: e50ebd3b50a4bf8b2832bf417b7b3cd9918c32f150c28c749f323d924eb19cf3
font_02_sfnt_off00011c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C66 10876 bytes
SHA-256: 103d4f1e0f7d70a2143d9eca862974bb044c1f4554978a54583b36f45bfc7f34

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