Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8b50b1d8ae3a06…

MALICIOUS

PDF

74.5 KB Created: 2021-06-23 19:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8703da24c82b5a65abe9bfba42f9d13e SHA-1: 971acf1c0af6c8bb27716fa2ccfc4b193063cab4 SHA-256: 6c8b50b1d8ae3a0622adfd3baf369c44ce3ae39ac8d6ee15571f0b83e51a060e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or further malware downloads. The presence of multiple links on potentially compromised WordPress sites suggests an attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=apec+ro+90+manual PDF link annotation
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccef51d383---zojadumivibozotira.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/samarepofotomesijizibod.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/82968362d521b4c97397c80542995bca/61023116354.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/pintuiii9tdjecfo3a9a4nf6t3/xuvebosomorapi.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/61004556703.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/95225188719.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/67218086477.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30b6908fdc---kefexifisorebubozoxa.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ced1fb56adc24ca0ace0b9c0bc139c3a/52973855163.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/rivelajejabimama.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/gesedek.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/19746101348.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/pikitefozu.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/60465445477.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/dabokiligakotuwetumaveg.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/pjnov6um7d9l5ivdecdl6dhdbs/34344460503.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_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 5188 bytes
SHA-256: 48837f9d46c99b0ab9224c99fcf52a0c954e5a81fe4fba4c2b63dbdab2d08cb2
font_01_sfnt_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 11520 bytes
SHA-256: e658f616a1fd0a6989ba9ec724981566900d6c6b5aaf1f3ed8aad7005cda9cb1

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