Malicious PDF — malware analysis report

Static analysis result for SHA-256 c974828dfe75fc15…

MALICIOUS

PDF

77.3 KB Created: 2021-06-18 06:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: adb9912181b213c46f51ad59c2e28960 SHA-1: cefd20464cf4576fc91d738361e2236ed3dea424 SHA-256: c974828dfe75fc15958d2c890394300d802bb9a841bfd2a60ec3ecc9aed94e91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress installations, suggesting a tactic of hosting malicious files on seemingly legitimate but compromised websites. The presence of a 'download button' heuristic further supports the phishing lure aspect, aiming to trick users into downloading further malicious content.

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://infrive.ru/uplcv?utm_term=the+shadow+of+kyoshi+pdf PDF link annotation
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/365d84pfcmtrk6o2hq63nafet4/71298452208.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5458328010.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160970c2271a90---konajusowive.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tfpso3cufbs8kd1q9qcuqs4qo1/navis.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210519091758916.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4suc4dhslfjftrduk0754sg039/36215830181.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/76cda124ac5c46a1417adaae55cb79b9/61372474110.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607929b6be0d0---zolepopogoriwobiwamaw.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/losamalutulazimevitok.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/1bd32d1dc86e44b5611b85a954dcdb6e/gejunizubuga.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608507ccf101f---tajuxasi.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/df4fpm17prru0jbv80bj7mv9s1/3545024563.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/fk0vnvok0gjcrdp65qidjb25f2/texekonolibinejosof.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/genafadefin.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/52c05c30aa04771b1f170e4118e99dc2/kupukexetejuxividamefi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 5208 bytes
SHA-256: a2e5329139257570c483af24eb82cdf82715809799fd982b1eb662bf094fba40
font_01_sfnt_off0000ff80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF80 12124 bytes
SHA-256: ca1e92fe2b836d7c04766842dac372072185ea162bb8b8afcba039da6be094f8