Malicious PDF — malware analysis report

Static analysis result for SHA-256 af334bb3c3e3b1b4…

MALICIOUS

PDF

101.9 KB Created: 2021-06-30 00:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ee2331250a7e703643b65d3bb3987fc SHA-1: f4d98da1ad354594b1553e1f8a668d13f12f8fdb SHA-256: af334bb3c3e3b1b497b43209d8dcb4ae03153df8741a0a4c9af7db0c1b4260f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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://pixomot.ru/uplcv?utm_term=mere+in+english PDF link annotation
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c4c1977a24ba96864f9dcde16d6472e3/3899486432.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/45396570491.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7116b2c27---61627993090.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/84754986926.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ir97nucfh06pdjosrq0l99jd7r/mitifedimuzuti.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/9fadaaatde8dkb69a3kd5sj4s0/24097455607.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/pikagisona.pdfIn PDF document text
    • https://aashianarealty.com/file/62758486284.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b239421eb6---28045986384.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/94439309186.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/545065781.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3d067824---jijedurisojaxivugeviko.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e40acf193e---xifevixefuzule.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/ratujopimabepesof.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b451277dfdc---22498689405.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/sudinizolipabepuko.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073688eca9b1---56131917666.pdfIn PDF document text
    • https://o-dance.com/upload/files/nomusonigusafusadu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/j7sb6ugu8h9q50iqe3k4sa7gup/niduguxat.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/wifogogegak.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/93941681168.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/76921505297.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d6da184c3247ca67e5a0b5252dae6b0f/22543215853.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-3/20210503074532214608.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/bumazijirokep.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

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 25984 bytes
SHA-256: c1ce27e3a09a7b79932fb9882c81129d70eaa7d7e0a3aa8889ddc2cb89668f95
font_01_sfnt_off0001310d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310D 3092 bytes
SHA-256: ce358cf3052099f14408d17fa6d717a9a2121e8ed0e086dd515e077c965c8e50
font_02_sfnt_off00013dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000155d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D8 10000 bytes
SHA-256: 38346c2a2b9235977364303815518e433596bde9920ffddbdf029a26573c08df
font_04_sfnt_off00016bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD6 18036 bytes
SHA-256: fe02d417f396410bfa8dabb27376726478e0a04e2f0fcc987bc1093a0c986fb9

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