Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c57d73d967e8e2c…

MALICIOUS

PDF

82.7 KB Created: 2021-06-26 00:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 297e348f3321aa0c4f6f534451e5f5db SHA-1: 7c7996f88908b223be3e283599745041c067f6fa SHA-256: 2c57d73d967e8e2cb53b2f8200a5a0e59271addb647cb70bf40cf2ee936a7687
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed for user deception.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e36f1bf5ee9c4825debee675f2ce768e/xatijafuzajaxowufuvur.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eef2564870---50409422939.pdf
    • http://ylpcl.com/ckfinder/userfiles/files/zowobu.pdf
    • https://audreyheselmans.com/_files/file/fobesufajadakisexawupel.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4b2b93f2c9647dd6f9f4bc10b0895ca6/23057716647.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a28a2b6b5c677ff76eee781f2c8e79ce/98363304854.pdf
    • http://au-zlato.sk/upload/files/13950414681.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d45225f70ac84f453c16d3035a5600ad/19262087881.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ih1addjlbsrl8m19hgckj2eth3/54903186260.pdf
    • https://abandassociates.com/ckfinder/userfiles/files/8638321170.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609601682dfb4---beruli.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/b323592b63e35cdea04a7edbdf7f080c/lifez.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/346df9522cb6f5849b5dc4f3e04a5e5b/17427730912.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b610981da25---21600584129.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/34990223cc9ee81605753694c5db4fa3/37826108398.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d46aca0fbc---43486057621.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aedd68004---48272925657.pdf
    • http://spoilersmensgolfclub.com/clients/865201/File/fajaseripinabifoxukeri.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082380349c96---xijuxetom.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a358218c79---temedinosivevulaxagojiv.pdf
    • http://fiumaradelsossio.it/userfiles/files/ginovejitepimuxinazegagek.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/4pe53stm0llnv5a0l58v6an4nu/fizasate.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/881bd64b0623a2fc2ff2f44844f51b6e/92961312023.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160714506981cb---bololunakusijuwanonili.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mcu+upcoming+movies+and+tv+shows
    • 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_off0000de46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 16792 bytes
font_01_sfnt_off0000f658.bin
28e852e8b4f4d797362448d4ebd8fe25e3e5090260005ebf1bccad6635edabca
pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 16928 bytes
font_02_sfnt_off00012268.bin
0cec8ce9e1e48f380b02ca870678068de85bec1627fd4ece1b332d8f3fa97dab
pdf-font-stream PDF embedded font (sfnt) at offset 0x12268 11060 bytes