Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6264af3b59e078…

MALICIOUS

PDF

92.7 KB Created: 2021-09-07 04:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d54d5847342116d64bdbe60ec0e6173 SHA-1: f85c43d2691166aecd0c2daa419713edde258c03 SHA-256: 4a6264af3b59e0785e78fec9f53406b9e0042d17cfca6aae05d73a47d6b914e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://aranykoronakft.hu/userfiles/file/livanewepurafo.pdf In PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/j9k7aqo3b801l2tu0kt4f806tl/nalifem.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/teziduropa.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/lofasadisibajom.pdfIn PDF document text
    • http://charivne.info/images/file/luzuxidapa.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/53739525770.pdfIn PDF document text
    • http://chromavials.com/d/files/bamovekatuxavosadino.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/4374e142d446c9d0a3cd1a556578eb65/muletitozivaselitojanak.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/27977854167.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/lavekibe.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/91925185941.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/050ea8d24ab8f7d82a0cb6ea628a76cc/sepulodimeg.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/mfv5nhuugrp8movftjs3acub69/31037136050.pdfIn PDF document text
    • http://cissi.it/userfiles/files/bijofarawakexu.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/96c65b5844df97b56c6cb6f86e192e12/83431832977.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612054112f442---72736021646.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/016e0117fe1b4fc46dfca4ae08185f9f/rikijofipipavid.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/vebemozifuz.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/kalenadijafixidisoxemix.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/luvamokimabenag.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/dopejegaganusokifufoj.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16118f93c6d34b---mowuluwij.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7a820af5b7c833a5df6f64d52ff7815e/bijukaxebap.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/jutakoxamexowode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=octave+gui+tutorial+pdfPDF link annotation
    • 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_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F8 10712 bytes
SHA-256: a6dd276d63326d37028776b1846ab95e3dd85f0dcfe067bf318eb3b8b6e3862d
font_02_sfnt_off00012f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8B 20088 bytes
SHA-256: 3aa6fb7466fcdcea5b979b164ec8b201d19842c2b3e3235fc89251944ab3a449

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