Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d29d78fbd0073c6…

MALICIOUS

PDF

92.1 KB Created: 2021-07-05 06:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9c6f42b9efb0d091287198a892982ec SHA-1: 6689594485c82e27a4d33f891b9a2096f0d07b04 SHA-256: 3d29d78fbd0073c69992fa6bc0fdee8d1029670ea3d108b6de8e9b63b97c68b3
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/adbce21eecedd724cdaf182724a22d09/99435424599.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/rcgjhi9kfh9icsnvd3l8tkc6nt/74638567574.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3bb7e577.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d399d6f2a87---4408110348.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9f94b8502---64887279903.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a93aee79549---53757547377.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/175c7c3a395c4493bd0a508fdfeee504/6356765990.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d4c37768---23253525755.pdf
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/56149181619.pdf
    • https://melz-feu.ru/upload/wuzopakegudedewis.pdf
    • https://renault-service.com/userfiles/xekowufivazu.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/g6qqnkubaoa15h3c6hfopn2dle/wovabipajilotibutufe.pdf
    • http://turagent007.ru/userfiles/file/86010154374.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/564918744f4e2b260272ec2244ea4f75/96773804346.pdf
    • https://shopinhome.com/ci/userfiles/files/dukoloxasekizekafepiged.pdf
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/jesofaparosedagixidekul.pdf
    • http://studiotecnicoforace.eu/userfiles/files/37968428223.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/795372419e14e6e386f6d1552f8e2e72/65575493570.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/eaa71c062bfcaa1e6a62c4875725918a/liligilezujusotutufuja.pdf
    • http://fine-cottage.ru/userfiles/files/wamosopurewosusopopig.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607323a2e186f---95378573135.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ldbvhim0om6r0qcdu8r3hpbq5p/40465184219.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/84bb195a85c34e2bd064e4c149e32d81/72461920109.pdf
    • https://maturana.cl/upload/file/24124053515.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a010d6275---zijiloxozakanowo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=nucleus+in+animal+cell
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106ce.bin
75d100a25c6fd305838d2b82590696aa8ce96ccf5daab48559d140767f3f4792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 17472 bytes
font_01_sfnt_off0001345e.bin
732dfc036081dbca8ff30a1c8eae4c96fcd990e755a51b341a234c0619dbfaf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 10152 bytes
font_02_sfnt_off00014b03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B03 16792 bytes

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