Malicious PDF — malware analysis report

Static analysis result for SHA-256 6192ac1f3fd4610f…

MALICIOUS

PDF

83.9 KB Created: 2021-07-16 04:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6188d8ddef11cdd1c52e57b9b78b6c44 SHA-1: 9b3c6ffb2a85a94a254b100a2fdf44a5f2d374e2 SHA-256: 6192ac1f3fd4610fc32be49b76a572a7affea1114767aa8a847364f6ffed74b8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://inwebjor.ru/uplcv?utm_term=cappys+bay+to+bay PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b581fc6f8cc65a10f22206a1de17863a/69218822404.pdfIn PDF document text
    • https://bloomeng.com/uploads/46749495239.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73777562233.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc52b39c19---73316671858.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/palotenosisi.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b660c75c29557202d8cc189e18d7a7b6/60007689828.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/55u2d89mt5vba2o0ror6agrph1/tenajiv.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/ginotaberimut.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73128552a---gigexegul.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/21402971731.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/41516233622.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/836f9021b78f61b038f43c4df41a8c06/72937274537.pdfIn PDF document text
    • http://idroter.org/userfiles/files/8763154047.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/dadewavibufuwe.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/28520488912.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50ca620aa---18754972364.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/07ae4ff62d63d83f5426e5d968d35566/23420147413.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7892fa17367a760804ce60fa2df604ba/solaleviniwabobabosami.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/26045526134.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/301945445177.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/a8n9glpqf4l9910b92597iekf3/kizilazolaxupakoma.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_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 17400 bytes
SHA-256: 3a5852a1f40d6c57218361cfc7e56b7b9dd696d68651d95d85ae88b2b746c6f1
font_01_sfnt_off00011464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7B 10056 bytes
SHA-256: f8aad72009fcdf8c6add3a2df04289360332964cc1e33f5aaf36bba6aee0eb3c

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