Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d194ce4c41459d…

MALICIOUS

PDF

87.2 KB Created: 2021-06-11 10:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 222b2957a3ebcd353f8a2708e106d4c5 SHA-1: 63ffb54922038fa7dc75dcfe0ff1aa952cd194a8 SHA-256: 57d194ce4c41459d102f94d56938b65c01dc6eac387172e3f50933018d0e00cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest it's designed to exploit user trust to redirect them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=low+mb+ppsspp+games PDF link annotation
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d528355ce2---63223764221.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/b4cea2b96d28ca4686b963e0bd2029f7/67816884904.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e8ec32bbf---5963572948.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beafbaf1412---1592326218.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a83f233c4fe---pubajasavabof.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/pofekolufitukuruzilofom.pdfIn PDF document text
    • https://vestol.bg/files/file/53789600851.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file/%5C/2021060304012223.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/19e8d11a51312f564961a37d6de9d258/vatujobonitu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0385841998adfd5cd1750953067854d0/31920448613.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609e177b3cf63---musemokodu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9321a5b01e505a0bb2b67693f2465891/99359342494.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/lelubegetudixipusowa.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beccd6127e---waxobidovi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d383e31851---bisolaf.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/9034884db35fe705d5602856ba2290e9/94446711343.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d9fb208aa---xitepad.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_off000117bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 5184 bytes
SHA-256: 7bd8c6d79541d1957b5d0009a4a807558ea2fe5a9f7cd4b1017f8bc2b4b364e6
font_01_sfnt_off00012964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12964 11708 bytes
SHA-256: d87b699d2ba4fd65c0054ce1441d0425ac86a435f0bc0e9b6e941c4d8c28c02d