Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c194a51b904978…

MALICIOUS

PDF

64.0 KB Created: 2021-06-10 17:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a7bbfc49a18cf59fec97c1adf5218750 SHA-1: ee13a04659ea3f92379b080a3baebeed3b265721 SHA-256: f6c194a51b904978c2027f81f7b886e8f59d6f354b446d9dbc322797c62394a4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI heuristics and link farm indicators strongly supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=tory+lanez+i+told+you+mp3 PDF link annotation
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d2ffd068a6d1d5a8c2e08cab9e8fd4d8/mukixoxolixenejebu.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/fuvofogasute.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/e08t6k6l30nii1dmgretfnvja7/79592533732.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b948aba9b1---60377834579.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/51657634519.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d8ce80e1b---naxutikaradi.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/23168779451.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c8db451860cb9091c211fdd025595fb6/64666752636.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a79ce0a3cac---juvefuvajisaditoniwir.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaba94d668---dopekitile.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bee9209e124---99099900601.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/54019741015.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/51338800962.pdfIn PDF document text
    • http://strandedtattoo.net/file/47472341503.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae03ff56254---pipilupaf.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0dbd599a41f2abf3c39b257206a1ea07/rorafedebutur.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/96378062688.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD246 5192 bytes
SHA-256: c260bd357fe928d1637531e864033860d246bc3ca7012c9922190b185929b507

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