Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb58edb91084a77d…

MALICIOUS

PDF

83.8 KB Created: 2021-06-25 19:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 071a38ace4dc2390d6c1f345018f2522 SHA-1: c37df658ca88b1c73939ce71378c50c85e9d62bb SHA-256: fb58edb91084a77d1669e092f2df60afab41473e7c6b76b9a624332172d40763
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic findings confirm the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/22e740c1402f9a690ab5360bd3f6200b/ludoxizosefejutozozo.pdf
    • https://paklya.su/design/img/upload/file/69855512960.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/75418816893.pdf
    • http://scales-center.com/shop/fck_file/file/13649624262.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/6tqgrbkk190d562d2valgm1st1/90504980431.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/26de4efdf73d66e51d87fcb3b74705b6/92178282005.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/jkokcdencrggg6nnn8040bpbk2/58029041679.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/9d9810f3ff1e10a53903e53938af6df7/ribikilazifofubibiz.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03899088ef---78917058413.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/opiuigv1c1tkgu7b2lusrgtg03/kofoperakujot.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/fqf1nlm1af050sbeggnrvua6u6/84649560018.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/7861fff9d8b6ee09a1cfb3102e53b78a/20266505651.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16073021fe68cc---forufeve.pdf
    • https://termofriz.rs//files/92946246631.pdf
    • http://saltokisport.com/uploads/files/basarutemevaxifeju.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/jcgie3g50rvr0ggceh3n9imguq/fagidibozuxanodeboniw.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2f4535da8---66161917215.pdf
    • https://netshopnepal.com/userfiles/file/bawemezere.pdf
    • http://polyacer-ecp.com/userfiles/files/20210625_004423.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b3c07787f---lefifewirovuwu.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdd889d249---kegatarojirugeluxopado.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/c3ert95vfj5ue3hplcvj3jq290/taxataler.pdf
    • http://ohappy.org/userData/board/file/55006342162.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9b4bffbc97cdb8f4f22848ed58680649/9081954989.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=lateral+deltoid+pain
    • https://medlineplus.gov/pain.html
    • 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_off0000ea9c.bin
8693090c97a0ba128a07c70cff275fb0b842d6cb9e76beb233f57adc712b3d0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 15860 bytes
font_01_sfnt_off0001136b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1136B 16792 bytes
font_02_sfnt_off00012b82.bin
abc7dde62201527eacff8f0ff4cc14c148a125377ab45a20e62defcdfa5d65b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B82 10172 bytes