Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f6142ae0c64770…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 04:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7316264741ef663dac7b426f9b371199 SHA-1: cc024f4a74240df42c254c544aa1f53723151838 SHA-256: a2f6142ae0c64770350303819d517ef105f8426f3d612a5c30baa3765aa876ba
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, many of which are hosted on disposable domains. This behavior is characteristic of a link farm designed to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0b7839dae---dodefep.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b98b82653---kewosiranifepined.pdf
    • http://shs1977reunion.com/clients/41590/File/85947153230.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5bf263a3a---43808860789.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/7d7cbb88880b71b9c82997cd1d028f77/33382399403.pdf
    • http://ubest.ru/images/file/92861280887.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9b7d5ff67---6432710259.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/00bbc98b95a084132db7ffa83f9000a4/70860402908.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/bea988459a5f32dfceea527577b59062/61502317797.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/j2qn0il9pqvqt46jumh5dgfah3/19722385386.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22e3bc960f---2690359259.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83ada68b8---penebabafasolom.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4655601d81209814110c6ae88418b894/21796876766.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6741d9126430fec9f4f1f5dd43cef985/50747259230.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087941758eb3---96417764594.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c83b82530---rewarebuburofus.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c7128bc2c---89237336306.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099abbae5fbc---92430966323.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/89242147430.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/00278fcfac5b15f023d10c2c2bc6a845/jojasesapinelil.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/66be53651b888824cb877e1d82b5c735/rurifosidazizopim.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160763d887d070---65987470806.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gfr+rate+per+day
    • 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_off0000f43d.bin
a5d164b2b782b347097144f9413a48695c9a08c160cad4debf6f66e3b63d3177
pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 10112 bytes
font_01_sfnt_off00010af8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 16792 bytes
font_02_sfnt_off0001230a.bin
d81b8ba5ef762406713eb110464184a285fc4dc28c4a2456440ca50aeefee8d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 17564 bytes