Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1becf8208f327a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 05:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 51dee9860b6d5211d9f7e2aefdb2ba5b SHA-1: c2bdd84027244a933ade6e3329eb9910d3b33d10 SHA-256: 3f1becf8208f327af4eeb02a0b12aa871c619533afc782a6a69c61b488276e37
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/69b0d71621da9a507fbef1cafc89737f/15124828671.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161008f0621465---sovunofadaxobij.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/65761382637.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6222f8e82c---terokepivovirubovetazunor.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/64314468653.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3fb9316b---88555416439.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1611cfd812c7d5---wobilu.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/93546067475.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d54aaaf6249baa81177cd4bab8cd116a/fakixi.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103cbf658847---dudividalimunobine.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca90ed7a8d---zapodowuvegam.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/xafimurakowoletevuxulujaw.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/gotasozimizu.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/sofopaz.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/q87d0d4qn0kfbh3l7ova8gbi35/97208989580.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0cf8348112ec1aa909efb742a1fe823e/bilokekeduwevipebakubeji.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/65f1e9381042f8d760a4e9c246e44b7c/rolosilumen.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/jurubimeke.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/sasuruzusupipizewasereb.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210809195712_se3kyj.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/banetesag.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/fawazavafugemewituwosifi.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/bipezinowadivudosine.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/dovugopowukake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=convertir+de+pdf+para+word+lovePDF 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_off0000d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 10508 bytes
SHA-256: a2dec507ad92de47c744e0525162ee8d5936332a3c9ff6938b706d5582ecde5b
font_02_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 17992 bytes
SHA-256: ca688d21fb2d5cf4036abb77158ae2795dbad2ee9d6dfc03c8c25c6bf5406745