Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb8cba63376af75…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 12:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4023c2946a12203b90b7bb1e69108003 SHA-1: 0cb2787e251e0408846cf5a0a52e98d213e05049 SHA-256: deb8cba63376af75e8c6714ec291ec450644515a2efe4ba4d2f378012c2db5c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be disposable or compromised. Heuristics indicate these are likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://vibingvibes.com/userfiles/files/32808772176.pdf In PDF document text
    • https://clubesolbra.com/uploads/files/94711903198.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/sipemaregip.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/75952811720.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/lafazedenuxotixudawetewu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b7a51c6baf5a5180d45d5db7ed2872cf/fopilafogaje.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/sematawenokojobi.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/21796710788.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/bemifolosojos.pdfIn PDF document text
    • https://whitesal.com/data/images/file/7715_20210907194336.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/lazexisawuwotimelet.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/65ac9b5e78845cf389cf49021c2e6006/dunojaxokovulede.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a3b164aabde623b132f24976a2b78a3/xixumufewibineziki.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/kexoxolenov.pdfIn PDF document text
    • http://theponghop.com/upload/files/viwototilim.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/7716327900.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161305c80e6c11---wosabaruxojoraru.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/14443964116.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/wekavegivexafezelenaverab.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/penadiwumuxaxixiwaze.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/90398978852.pdfIn PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/86569409042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+football+games+for+android+onlinePDF link annotation
    • 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_off0000b35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35F 17116 bytes
SHA-256: d62399a2d0f8a3384dfb3eafe6d0eabc31c7cb00808e87a8ee32f9fd3a497e30
font_01_sfnt_off0000df4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 10888 bytes
SHA-256: c4b25c9da378be76e1ef9e0ec94a3e1eaa3b8769e12859439afeb99273b962e4
font_02_sfnt_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1