Malicious PDF — malware analysis report

Static analysis result for SHA-256 1591139872338ad4…

MALICIOUS

PDF

72.5 KB Created: 2021-06-12 21:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2df05517ceebd2cd315b72ae61a78925 SHA-1: 18e461c15d80f20c164e534c6d61b60aade0c26c SHA-256: 1591139872338ad4443eb9d84d719d57b2d2b2249367311d736098d27cfcb3f5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit users through these links. The document body, though heavily obfuscated, contains text related to a 'free love compatibility report', serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=free+love+compatibility+report PDF link annotation
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/h3ns9015np831u364b0jvuei3b/dofozapuxilogagokigutubip.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/u5k6kf4ctlnrsnjfgiafdsd70h/bixedonelofefidetib.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/nupelutafokevezu.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/rf4chp6ns9m697j8vbkhne7d97/29922096001.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9c0a50bea---nesaj.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/729a1b0df27f210f82e1930d6028c56c/9380792214.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bab0fe6790e---50268131925.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/af3fd70a12a28a9715d818489ab3f4a3/93429483677.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/93519654474.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/163688461db527e629872cb72966ff18/82261727686.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a119929a4eb---besodibajawusotivera.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b82cced69c4---kezogijim.pdfIn PDF document text
    • https://faprosid.com/file/92053436052.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/3faae22e4671db188718fc5ffa2ddeb3/39998974437.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/renopotogapopisabegu.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/feraribubizuzid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD200 4840 bytes
SHA-256: aa187d1b918569baa4871d8a46ae07e3508f08721258519821d54bf952b0724f
font_01_sfnt_off0000e27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 10756 bytes
SHA-256: 07de182f71fe4cf44c81832c76c62f66fd8e625bf0e2f1097696cc1257a4d05c
font_02_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2