Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39209109d2c6461…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 22:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93016395f566d7fd1ba41950a661120b SHA-1: ebde6098598a9083108e69f1daa22643155462da SHA-256: d39209109d2c646141f3281dec361c3ed1e5ff05a6d822f9d7c025ff5b1fb7c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure suggests it's designed to lure users into clicking these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/220a3c2450ebbb173cc803d680082428/8120420346.pdf In PDF document text
    • http://iproperty.ae/userfiles/file/zezudegasukize.pdfIn PDF document text
    • http://quinta.cl/upload/files/rijani.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/7e8148e842da7ac1286763e32bc4ec5f/seduvatelebuxokedojofi.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bce5be9c60---98084470774.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/52405397898.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/95c9640f709df0e00c12a6fd9fb336ec/mixivokuki.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dd2fd76fcd---sijuwalupobesaf.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/97536606842.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/aaf9e41ed11b2f8e694e106aa0970639/dukaramaguluzazasubotore.pdfIn PDF document text
    • https://wrd13.com/force/file/namujufexirivukuv.pdfIn PDF document text
    • https://zagi.hr/files/27934486255.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/86040261209.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7j4rnbigpdsvohjp15jur230i3/46241528492.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/sabififiweletorix.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o1g29hb1506i705t8lj424p1e1/nobije.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b896ce539---wopokefalozirotefovuzif.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160832f4f88324---91004071473.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/99503233502.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89fcfe5137---38274701946.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ie021o9u6c61cdbfq3c1cpjrj5/50065520556.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e8b9df76---22645915509.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/8im0sgo3o3mmb5rm8ro22bfr1j/belusogaxixivuv.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/otp30fvpa3l9vi0a3baetlupi2/tojodugul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cobra+cb+radio+repair+manualPDF 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_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 10680 bytes
SHA-256: 6d45052ab49a0d7b9daad1f1db74d1fb56976a9ea9e1d3eeb4df9d29d6f46007
font_01_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 17248 bytes
SHA-256: a836cb5c1c5bca9bba7160d4553056448a6d551a6cfa96849d0d948fe879fe27
font_02_sfnt_off00011bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1