Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d76f883f174d40…

MALICIOUS

PDF

90.0 KB Created: 2021-07-22 08:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f3ddd66ec13839771f67631a2193059 SHA-1: 2462a6f3aa56e262983a1b81d3b7730e1a062375 SHA-256: 71d76f883f174d4017266cce88bb64a1b5074e906d4ff1dc61fb904bca2fbe4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML heuristics classify this PDF as malicious, likely a phishing or malware distribution lure. The presence of external URIs and link farm characteristics suggests an attempt to redirect the user to a malicious site, potentially exploiting a vulnerability or delivering a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://skolicka.eu/foto/images/file/jisob.pdf In PDF document text
    • https://euroroma-bg.org/files/file/22195295175.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/31846959966.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aea9681f8---22688282268.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/86919132548.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b60eb2803ecb41d12c4ffb3d115bd3f4/kojugelixoxigidufikov.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/mng1vivafmm76na2snt9cko31k/kapowalepedunem.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/765b570433b4004651611dc37e2b6736/15126612804.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/39972179226.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/fe490020791099b6151df17d3c521351/duluwo.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/lajasitenedewuviju.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c158e0ccdbe---95542622117.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/851d46ad139cf1077e9e50314d71dc56/37726966749.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d7946d1d1---zuxadibavigufofijur.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9d061e286e05e31e53a33837777e9d30/telusila.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/a8no4rim3mpeai5o1a960tiil7/19142807121.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ka3ulsumgej22pp0n4k9h89ce2/11531285885.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210713121044625001x0o6crc8gegj.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/79244735327.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/86681151884.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/60345607322.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/11726128571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hobbies+and+interests+vocabulary+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_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 16756 bytes
SHA-256: a0fdd5a1d76b3efcd34f5c0d98dd3b4dc002abd6830faecc083bf8e1bcf836cd
font_02_sfnt_off00013f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5C 11024 bytes
SHA-256: 55a5e98a672ea022cbc099444371bdce2b50c4c17b2907373d09ae9fc26760ef

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