Malicious PDF — malware analysis report

Static analysis result for SHA-256 2969f3948c956277…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 19:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75d2c27a2d7064ae0e4e71a9bcb7d47d SHA-1: 1e68b91ef037ee553219807cf34268b87999782c SHA-256: 2969f3948c956277762078f14158e3de8a46164e81389cdebcfe5f287017c1ec
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous links on disposable hosting further supports a malicious intent, likely to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://venusnvs.com/userfiles/file/80657445422.pdf In PDF document text
    • http://woykoff.hu/upload/file/5588740060.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612c13c840b79---83965595508.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/60e598f578f012e5738deca0091a8069/4516283802.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/nogexezuveruz.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/81511836280.pdfIn PDF document text
    • https://onlinendttraining.com/files/26546039028.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf1e78fd6---51494227074.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/wulekixedulawap.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/82380650157.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/5m9thpjvrkrqca84auqm9unon0/78294995257.pdfIn PDF document text
    • http://sergeybazarov.ru/file/tomumideso.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/64544777256.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/vugivimak.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/zesevajim.pdfIn PDF document text
    • https://svetozaragro.ru/load/file/zutipijapokimitepapiv.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/dipotinamibatom.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/13828220742.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8202aedb9ca464d9939eba8cd589b520/25658218499.pdfIn PDF document text
    • http://kkitv.com/images/upload/File/26732942084.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8nmh0k9er39aj5t08k96kc1rh0/89053109202.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/17163584489.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/skd3n7c5vq27c2topdbju38qkr/pedogazerurunaxuw.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/xevarax.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609da26ad25c1---88682734781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=free+english+worksheet+for+preschoolPDF 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_off0000e95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 10752 bytes
SHA-256: 1ca2d1270ceb09771326051ecad1bf13c05a574bf0b4ddf60527b0736071e16c
font_02_sfnt_off00011a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 16984 bytes
SHA-256: e8f3538494ed80f61f00ba6e931ddd695c258d601ff66134217ccfed46cdd5db