Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f4e1bf25248c66…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 12:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb638bfab4b7a698bd0a43d8d7133730 SHA-1: 5d06910ecf268c3eabaeccf0bc733c89a37d6882 SHA-256: 77f4e1bf25248c66f69132c4ce029f0d82fe4e705858eb2e00f3d603d38f00ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting it's part of a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, as these are common tactics for distributing malicious content disguised as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ketchas.ru/uplcv?utm_term=making+fillable+pdf+forms+free PDF link annotation
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217a8d43206---58514371711.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/15272394416.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/gamorokopozupez.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/xepewewuferilejadanewuja.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/kukoguvopiwodomipofuzimen.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/25422776158.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6faf24bc62---81367390252.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/85609184426.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/77150137187.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/xotidugivisotosozusalel.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3888eefb13b22af3ccce43fbd37f1731/xumepuzezorilopo.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/ligerukimeni.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/82808751848.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/jitekagikax.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/zozal.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/pixuwonizug.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/13epva8qqvv19fd4au43m0ndif/65485901848.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/69184186423.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/68e8da199b1423bed9adcbb7e72efbfe/pamiw.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/81408930557.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c74c771ec3d---12869218369.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607db049b3a56---kubifidufak.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_off0000dce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE5 10968 bytes
SHA-256: d32481c98b7a534cf69b3c8ce04b199ec69b5144f2f11fcb14bcf418dfc6bf49
font_01_sfnt_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEE 17780 bytes
SHA-256: 89c39a0ffd4f5df5ff8b989ffd9f8ee9bb4b42c52e259a0ae58d14b183abaa3a

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