Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c822cdc3538076…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 22:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89c9d19841403fe181418ec442c56db9 SHA-1: 595067cd40997a85a4058ada459f63ae49f0b325 SHA-256: 86c822cdc3538076eb307f84dac4430922d366bc9a2b6d06b4026c601a5ee48e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to phish or distribute malware. ClamAV detection and ML classification strongly indicate malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://halongbaycruises.org/upload/files/meluvamilugabe.pdf In PDF document text
    • http://lexxyin.net/files/fckeditor/file/birolefegikif.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/xikomojovuwajuzigaj.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/lenirigilofazizak.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/budatigigof.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a2910f5662a6cab1ae56650c40d3ef2b/disevuxonadapareje.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/409676039.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/loledakupagixarivafiwuv.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/jukorewosilosenakagi.pdfIn PDF document text
    • http://xenangheli.vn/public/files/78510892020.pdfIn PDF document text
    • https://strechybenesov.cz/content/62307778249.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/33384856542.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec0959fc14---14660237621.pdfIn PDF document text
    • http://pololanna.com/user_img/files/80847809443.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/pakewotugavadakibafaxanev.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9375bbf7d85e16d83a38f318ee8b7b25/dirugosixuxami.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/folawi.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/zokajinibiwudaki.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/337246a28d06c189cca60da8e67f82d8/88750685728.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/8124914576.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/54742051815.pdfIn PDF document text
    • http://olympusflights.com/files/files/minik.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/98625133408.pdfIn PDF document text
    • http://idcla.net/upload/files/bofaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=read+shadow+and+bone+online+pdfPDF 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_off0000d559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD559 17716 bytes
SHA-256: 3d22e574b61ee221e173caf30d846d3f9737113c38270ffe74814af02f375514
font_01_sfnt_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 10668 bytes
SHA-256: bd8d073a9034665ebba2c312c4fa22a2bb1aee36a44089032f4cf8d712c0989b
font_02_sfnt_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1