Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a92813dbc6af337…

MALICIOUS

PDF

71.4 KB Created: 2021-05-13 19:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e792d1891d74e93a7d9677b8dff94eb9 SHA-1: 7f1edfc202e1280c0500afa70300637d45bdf8a9 SHA-256: 7a92813dbc6af337df9880aca980fcf0132b91c5e2981fb85902020156facac3
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sasalidayanisma.org/uploads/file/ferarebidojonubag.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/3sakfd70vqh2qrdhi54a1mapo8/bizelukisi.pdf
    • http://dzbnf.com/upload/file/%5C/pudijinipaviwike.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a73894cd6f---80980363886.pdf
    • http://amadpich.com/userfiles/file/zelaxamevugepepanaxol.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/29c0248b8c65f73a3f7848daa0af6b3c/gisinapemuzewud.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076278a2f888---kegakuvifugo.pdf
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/ca0e0ad775694e4e4e91d79979a44f86/dimoxusefelamofexujavevim.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/0d8d27604c8f85dcfae9c92b1153895f/lodosugomilalevunumubob.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/25857db53991f8349d7dc9803f054f94/sonokarewabam.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/042d87726f5e5bc3525bd39d3eed7760/59445106650.pdf
    • https://oklogistic.lv/upload/file/30105849930.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/mk6ua1vjoposecd70hsdvk3s5p/velugoziniwuva.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/612891f7d5ff034e02fe986b4527c8f8/99224889651.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096531cae80b---29371321011.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ff1b1e80---gugomunenoke.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fba0a89a8---dozinesubulitavegon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=diploma+certificate+template+psd+free
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84e.bin
f40195ada556849f3bc29bc3b7b0172ac2216124a7ee3575eaf7fce7dcd04ac4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 5300 bytes
font_01_sfnt_off0000ea3c.bin
a88c6293a311a60ac1fb26d133112653894b4b4e7f6cc0813ed97ce5991bf7d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 11904 bytes