Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6decb2eafa606b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-08 11:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6816cb69731b29afe314bb6676405296 SHA-1: 210fac958c1a8cc53e4f6707120ea355bc15f04f SHA-256: ad6decb2eafa606bb55827d6ab80d32e6e8c688c0d12bf6e38432019bdee4ab2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of a link farm suggests an attempt to obscure the final malicious destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://garglob.ru/uplcv?utm_term=skf+taconite+seal+pdf PDF link annotation
    • https://gplacestracker.com/userfiles/file/26603831891.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/dblicgsre2e2qqafervqjot9jo/96000689950.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/pataxarasuraluveno.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/bodekatunemijesewij.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088f26257457---wopijisa.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/bediguvegu.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e5b8c914---lavelonarirufaxopimor.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/7584e0ddbf30f3935a52c77aba9376ea/280865263.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c51b9eb3e---16256454491.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16125b0ea3d80a---varuvebumizir.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/wubesosedasajim.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/kelevodulopirifok.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/jesexalusofosav.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/mirisudi.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/96161450478.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a04826528594d069561a1c76a6ad754a/43155413609.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/xadudupovaxijovejekemix.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/xivekagu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be754f82ecd---wefukitosivi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e02e94d9---wubewojeji.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2a910ecf840bf8eebb43d88cb570d29f/zuxifaduzoluki.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ca552ad45e58df52de49511ecf3d8f02/mozojufutodumuraredebexo.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_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 10680 bytes
SHA-256: f622f89e98c412d29be8e300a188e98dab1974923798111fd02f923f7b31b83b
font_02_sfnt_off000119e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E9 17260 bytes
SHA-256: 2d173e713737e4550ea4ddcd0b2058ad95c3fb4a3ef1370079e0012c38aa4d83

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