Malicious PDF — malware analysis report

Static analysis result for SHA-256 388b4a3b939b4769…

MALICIOUS

PDF

88.9 KB Created: 2021-08-08 16:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bde38d0b86a3fd72395c3b8ff14f2cff SHA-1: 41ba53b0a1ca93a7e2c0e70e50693d2a55c47169 SHA-256: 388b4a3b939b47699bc463bfd7c04b6a408b3dbf0adb334ed22c25220fff9013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a link farm designed to exploit search engine optimization and compromised web infrastructure. No scripts were extracted, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful sites.

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://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/0obdtb9b9a5299j7aq01ruc4kt/mibodokaxedewogutu.pdf In PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/60016800537.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c775841d3f2---70479354463.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/97862347774.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f025d1f67---43901560228.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/guzakogoga.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/games.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d49ed8c4798---mazalapokijasadefomoxepop.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/75471633116.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/bolagafasevalidoxapunizo.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/4hp00et0dj57i7t7sqt7eqbuhq/paparubigasifodegumav.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f367987ce9b74707c3591fb79c63de78/xuxufixupo.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/livilifofuseto.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/povazezejixixos.pdfIn PDF document text
    • http://3q1p.com/upload/file/210630162234171876u76ml3v69iih.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994401a9599---39784299956.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e05971b55---9333260091.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/81171810250.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/33982430754.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/82ad7cec136bcfe517a2cb513245fbb2/dodunekokadalebobo.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/27336543149.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6b3f2712b35ff54a38984d87fdd09224/21561105745.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a56b9624834---xupojux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+loom+knit+a+flat+scarf+on+a+round+loomPDF 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_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 10776 bytes
SHA-256: d03799a86223443a5a7c8a520bbca7c5039e9e638007b95822cba2d695361a1a
font_01_sfnt_off00010ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC4 16912 bytes
SHA-256: db0890934dca44f259ec5c902dac872a93fc42aeebad60e45efd75f97def1e21
font_02_sfnt_off00013aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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