Malicious PDF — malware analysis report

Static analysis result for SHA-256 3939b643f4809660…

MALICIOUS

PDF

97.5 KB Created: 2021-06-28 15:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9ca01b3ccdeded0326f3c3c94fb274ee SHA-1: 00407f1a534a6c19674ad3136a482b315e970258 SHA-256: 3939b643f4809660977b67b6667d3fef3fca306b5f04c82802762c929c373646
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of external URIs and compromised CMS upload links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://irlanc.ru/uplcv?utm_term=100+oz+equals+how+many+gallons PDF link annotation
    • https://kildevangen.dk/files/71044055212.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/xolezefobeguregumojukifi.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/tpp6p6i40boott45s1ka9otab6/temarukivojoratu.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709c0da20e9---zawubakoxexitej.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/88031704472.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/c1lui7pk6okhnsn3odjma7hke4/22294735386.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079640eab806---67714228254.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/984n2sf52h03a8e4oanbv4fvrv/velezerawuzobeki.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/89315753231.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c3871a74c---96497312087.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/4748da3bc3bef04c86b139b35945edfb/79062356555.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/mkvj9rno90jgqdmgl96lqqv263/merewime.pdfIn PDF document text
    • http://dothi.info/images/files/lekadoluzelefafutugoj.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3420b2c03dde9db9f188d87e576fb479/sifojibofinuxukikidi.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee5dd6be62---siregaxekisirosorat.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/t3abmg2v5o02ttc07cg0u8id41/duxirazavulapivavunukim.pdfIn PDF document text
    • http://nktrading.qa/file/files/70856310184.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072008de47ae---buzibotu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/62705702eff4aa690d439c8a4894f618/18582675850.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00e7e94db1---99880048434.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/5ff697ce706a2af9f9d4623d6ec0ab59/89844101020.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7ef5ba20f80c50edf695e30b99889be8/4044663594.pdfIn PDF document text
    • 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_off00011aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 10848 bytes
SHA-256: 290e86e14fc5c2f2f3741e004963396e251dc03daa1b6d733f68ccf103f432e8
font_01_sfnt_off00013357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13357 17728 bytes
SHA-256: 7bd9c543b47c8223630ea19a763db53a80786fe2dcce2a09e19fb39f3558f37f
font_02_sfnt_off000160e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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