Malicious PDF — malware analysis report

Static analysis result for SHA-256 83598336b2920548…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 04:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1339efc88ce864898dd6e5aa9c65a2c6 SHA-1: 80206372c180349a085610273b9c474b7ceda631 SHA-256: 83598336b29205485f06e5f2d0e06b936eec31ee3bd470ae2072f047efb79faf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the presence of numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggests a link farm designed to redirect users to malicious content or phishing pages. The file's structure and embedded URLs are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e790a2b51815a819913fccae209d3f88/fefowizisiwodagoliwerutit.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be33d86ff7---togajefodenefu.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/70490550709.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/64602363755.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/89309555923.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5f88aa7d1de1e93d22590d8c67fbc866/29799450326.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/13219537466.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f973253375---3507035773.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/37054488063.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/lonumuxujikigegigozom.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210924_4B2592B0DA7141D4.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/jevurolaw.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/65681113958.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/544899671.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/57996538113.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/75759179948.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/79245242006.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/nilosejoberajidulujibadi.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/60560271225.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/ronod.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/vibuxukadu.pdfIn PDF document text
    • http://neteyes.eu/editor_up/fevudirodizadorutuwov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=add+jar+to+android+studio+projectPDF 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_off0000ae5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66E 17380 bytes
SHA-256: a8137ed859a6825260997367300e27f19fcad86e0330640d995d36ec9572326e
font_02_sfnt_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 10672 bytes
SHA-256: 51b480e702530b70805c16abf9f1e8d55079d3eb19e9f9651d30a364c2f18e58

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