Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5592f2c25d66fc3…

MALICIOUS

PDF

75.9 KB Created: 2021-06-11 10:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a7c72e5c1c23267c8f905d8497752d59 SHA-1: 7faf1bdc210e7f048206d01f3959257cf0dd3b71 SHA-256: f5592f2c25d66fc300ff7b4e315545a795744764e630f300b25828c9773dd3bf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to 'racing offline games' and is associated with numerous URLs, many hosted on compromised CMS platforms or disposable domains. These URLs likely serve as lures for phishing or to download further malicious payloads, aligning with a spearphishing attachment attack pattern.

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://drafthe.ru/uplcv?utm_term=best+racing+offline+games PDF link annotation
    • https://paklya.su/design/img/upload/file/boxizufudomunuwix.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/mapikavesanola.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/30940578944.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1668d289b95818acca5ea6cdda87b16b/bemomaxugusemowiwep.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf9d896993---9167109834.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/8ebf23677fe5066d5296e75e5936144f/zifuparikegurad.pdfIn PDF document text
    • http://dentherapia.hu/files/file/basabawemifarilidomilofez.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160960ecb2770b---wevetomotunizipodupunu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280406444044.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/34420392f4db1ff9d1e79ab86a24fad1/meveguzumubosajomeroti.pdfIn PDF document text
    • http://soupworld.de/upload/file/suxofusezasonul.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/noturalilunilelazolugafa.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_off0000ecfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 5252 bytes
SHA-256: a0c67862069575cef6dedb92b78987061463f5bf453d22f1206db7403370fcaf
font_01_sfnt_off0000fec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 10580 bytes
SHA-256: 627467307afff27e3812472b70f2d2a1ec3b0e49f7b654e96b834af3178da832

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