Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9e9320eab898e7…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 04:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 826e0fa7e96041be67c5831fdb26a859 SHA-1: 07d5be6a46c2a9d83dbb8d1e9f9819baa7f83314 SHA-256: ed9e9320eab898e7c24db16cedbebffa122289a25c82206474beda2b69e92e1c
184 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. Heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, aiming to trick users into interacting further. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=rear+wheel+squeaking+when+turning PDF link annotation
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2737ad71afd372299c5688a657bc6349/73688265271.pdfIn PDF document text
    • https://maria-galland.ru/files/file/fuzobunesas.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/46597783674.pdfIn PDF document text
    • http://ruihuitax.com/files/file/41395084821.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/97334581857.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/ximamusewam.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/31400899699.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/vubulipadereganoxawobiket.pdfIn PDF document text
    • https://partetesal.ir/data/file/widiwerutavomek.pdfIn PDF document text
    • http://naso10.com/userData/board/file/37269130406.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/dejadebo.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/3335407642.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/21063415891.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/pojusuzoreramimowel.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/21837800217.pdfIn PDF document text
    • http://1careglobal.com/upload/files/likixaramefowijedabufu.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/62782823419.pdfIn PDF document text
    • https://moolans.com/uploads/files/xexumukad.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da943c0b38---59986407582.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/lavorewegasunugitag.pdfIn PDF document text
    • https://cityface.cz/res/file/farug.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/bofoguwaburevipufixeboto.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131f26ec9946---dovijitokudamixefujatak.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/sazesawipukaniguditumapun.pdfIn PDF document text
    • http://nantong.chinatupai.com/web/js/ckfinder/userfiles/files/jototegasorala.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB032 16528 bytes
SHA-256: ed8e8f9bd32dcb190e5d9b3d6438afacdb8822e57e7c8d3bf04a15bfc5d509f3
font_01_sfnt_off0000da20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 10736 bytes
SHA-256: 061a04dfd94b8e4cb2f8c38c2ac9db74088299b2bdcd32a1975379185401a2f3
font_02_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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