Malicious PDF — malware analysis report

Static analysis result for SHA-256 671ca3caf2513e95…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 23:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47f99191a6521fecc71d09324649060f SHA-1: 1b9500cee8fcf859e91e776b81c14c8efc921451 SHA-256: 671ca3caf2513e95baf86b2d62ad8a41a199387cef0b81221a8a595df257f2b0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=pokemon+porn+games+for+android PDF link annotation
    • http://stroytehcentr.ru/images/file/vuvejijudapi.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/kajijisigax.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/parisasujubuposisugo.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109021521283428.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/52734304592.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/kevitalitegilupu.pdfIn PDF document text
    • http://fteq.ru/files/file/bugixepadatoximod.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/73670145621.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/36gba72g6qvqjdvndpb50vjk71/begabaxogotesixuxemofa.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/24963828533.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///72528746337.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/liwajaziba.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/70ce0n0lgaooe7g99ia0c3hvfc/29888110139.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc934a5683---60354323967.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/kajofewevodovenil.pdfIn PDF document text
    • https://sadex.pl/fck/file/botafetuvejadav.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/13627386808.pdfIn PDF document text
    • https://mauspro.net/upload/files/gidegurame.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/xomunotirefu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c4401aadbe16d337bfb0e2ba5f39561a/jaxobav.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/vexixojumasitejijudelif.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/duxaluwok.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/pumenekujulubatubumimaka.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 17588 bytes
SHA-256: 6bff81358ced3603c39279bc6d85d0d8994597a7f887004e96af5c42e12e7d5c
font_02_sfnt_off00012331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12331 10792 bytes
SHA-256: 1dc41443b0e51d6d80df6194842779308a736ffb644d7885f6a19b8bf4d28fe3