Malicious PDF — malware analysis report

Static analysis result for SHA-256 946c989b7817f8f6…

MALICIOUS

PDF

82.8 KB Created: 2021-07-15 22:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0dc1948394e605da18f19d5504b0a81 SHA-1: 49597da5bc28105d9e0eb98a40816fe9c95aeaed SHA-256: 946c989b7817f8f6213e672851029a89b9fe6511671650426504157f68300702
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3cece8ea9a6af1573502112c3e791695/vamuxafakisikasurotazu.pdf
    • https://vietspices.asia/uploads/files/20245139820.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45640a907---98084317092.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa13b782912---76878193955.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b06587af1651035a35d0325ed13e1b20/kozewegobafabelonaxiwu.pdf
    • http://malbreil.com/userfiles/file/26766956920.pdf
    • http://wujipacking.tw/upload/files/17895782817.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e2eb8a7329d2c8cd7effbcd30030b344/joniwuzovawir.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9c99fb343c8f433d673f3c80d6c8128e/tupotexipiji.pdf
    • https://vetamblj.si/ckfinder/userfiles/files/nurugitenobarebomabono.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/429a33c0fbd27753f609ee7bf967a773/45590059129.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a69e40963---80467305522.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/2ac09e53e206200b4bf2867f6420e5b4/34541076890.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704009012a4---jijasititujokinupus.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/47269bd15ba5e77f6d8a8532bcf527f0/jazuvuxotugixamipuku.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dd4aeaa4f508320bf8149ffc8c8b80eb/kaxatabatejigexebibunu.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8141f37b7---baparasiribe.pdf
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/xogexajarasekudi.pdf
    • https://medtek.vn/storage/file/65141725132.pdf
    • http://web68s.com/upload/files/dogetamoxarujilapalogorab.pdf
    • https://clearpatth.com/userfiles/file/57689850313.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/b2ae6047d6feb1735d9e566e9b17e442/sixekikufebibupejumag.pdf
    • https://prosaison.fr/userfiles/files/18667826155.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/0bbd7df3aef493d2c5da67621f35e73c/64550009769.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=68+mgb+for+sale
    • 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_off0000e3a1.bin
553a333369216032d58a593d050ca93cdea455d60bbab9104d430892f5d34717
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 10684 bytes
font_01_sfnt_off0000fc22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 16792 bytes
font_02_sfnt_off00011434.bin
97046f94994fb7fe05f06217c756333ada24716d61b059bb27e5c09f5af1e505
pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 16368 bytes