Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8379f3a6b14d03…

MALICIOUS

PDF

85.5 KB Created: 2021-06-25 23:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 099d3c5bb10c455fe0ec2695de43cb1e SHA-1: 56a0e6b091ef9bb418d87a06f7dfa8e17a290369 SHA-256: 9e8379f3a6b14d033f7d458c24898d518a7cf2506f15e687842a5e54b6aa2e9a
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate high maliciousness. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further payloads or conduct phishing. The embedded content is heavily obfuscated, preventing detailed analysis of any scripting, but the overall structure strongly suggests 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://web68s.com/upload/files/kenovovokaxofa.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ec12742baf2e847940018f2aada5b41b/49738199518.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/kgfamn8a9ig31u63dov1vm1ph6/zuwometete.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vhlulce3p0ue3n2oiskn8tcvt0/781610684.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093d1b3512fc---pexez.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d373aaa4761---30304590795.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/af7024f79dedaef42ca63e64356c6a53/49940630170.pdf
    • https://giriconsultancy.com/content_files/files/jawitasibokexipo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c994b322e3c---lizopodavadomubinuva.pdf
    • http://jtour.vn/userfiles/file/pabenusew.pdf
    • http://alimentosldm.com/userfiles/file/zomoj.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160752347b6e20---28655853686.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081890aca00d---paromukusak.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ed06bbaad---23993024229.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae6cf2523---46299505280.pdf
    • http://studioambienteterritorio.it/userfiles/files/rakeva.pdf
    • http://erpsamik.com/ckfinder/userfiles/files/legilagudejo.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41d8b2dde5---modapigojubolotavefano.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098dd0e18b86---buguzi.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/t8cp8bi8k26l11j4c0frljqou1/xiruxome.pdf
    • https://autoparkalbanese.it/file/50768438656.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/53aa22927f5b945b23c256e4b61d1d2d/xiliwemepamarox.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=will+handmaid%27s+tale+have+a+season+5
    • 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_off0000ec9f.bin
e4ac5f038e1ecc01e4b4d4415707a4ede23a068b8c484f5aea77c3df432c5892
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 10640 bytes
font_01_sfnt_off000104d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 16792 bytes
font_02_sfnt_off00011ceb.bin
75805227afb7e761e44db4b5906803e2bcba264b3b7b2a3ed1ff78b0f7d00cbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 16920 bytes