Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a9860794b11eb9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 03:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: da4cc85531f87d2b18032d4ded73423a SHA-1: a9a00fd3d333fe059f7b953bb1d685b26460fa71 SHA-256: 39a9860794b11eb9ae892abab48b42a2516beab667114ab058580957b3e0ee67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many pointing to compromised WordPress sites, which are likely intended to lure users into downloading further malicious content. Heuristic analysis and ML classification strongly indicate malicious intent, with ClamAV detecting it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/c5750731b285fdb0c002fd4ea12966dd/74740939967.pdf In PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/mibuzigozinas.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d662443bb23---safitiramizujagi.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/60538978789.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8vtv5ib9g0vcgcqtn29l38i2om/juzudalamulaxarabopaxefo.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/73947415312.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/nawejiwikek.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b53d1469c---19546522991.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/65101114982.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa3a552485---69600096113.pdfIn PDF document text
    • http://sro52.ru/uploads/files/27299839836.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/fededilozunagigunigovizu.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021051619524610547.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faab2167874---30280366697.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/cbddcdbee8ccb7607516fb623f2f8507/fopefekeziriwobenozub.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/19238887357.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/98631894332.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/6780355781.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072a41f812dc---49360581125.pdfIn PDF document text
    • http://sungder.com/upload/56382433845.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d922f16338---2704647227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=kannada+small+moral+stories+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_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 10652 bytes
SHA-256: b268d00c4dca5d8f1250344655f47c7218fdbae23a1e2ab3c34b7b2c05f7b3a6
font_01_sfnt_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 23544 bytes
SHA-256: 0a3249f88a6d3274ca12fab0836bed4cdb948bb15e6c20ba4d8eeabdc17df59a
font_02_sfnt_off000123a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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