Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6279a6806102952…

MALICIOUS

PDF

89.5 KB Created: 2021-07-20 12:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d54d0b8842000c3a637c100b7fcb9db7 SHA-1: c14115794473ead2c6771369fac25b29b0bbaa99 SHA-256: f6279a6806102952003357872e0b307397d0621ddb1c349ce2cf5498b9d5d222
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e246c1fb87---kunaduxigakogariseda.pdf In PDF document text
    • http://evohome.pl/userfiles/file/minasedege.pdfIn PDF document text
    • https://virker-ikke.dk/files/momazafe.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/tonobivarozokotenivuzos.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/bixopupanesonasewun.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202166234953.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/17546141706.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f57c84050---91859088732.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/vulewukuvozakabako.pdfIn PDF document text
    • http://geose.ru/userfiles/file/lajuxagisibeturo.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6bcff3fd748760bb372d3de0fcd6478f/wekadowagemozipofapome.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1f086a244e372d80bdef0f82deb5f42c/bodusejijofulogu.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/vonabomo.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/79967582157.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087db85e072d---lifisulusejezewaludufu.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/88674562024.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/45163461709.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c47278aa47---36341348561.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/7pk546d5o772h7nqar7if91p9o/83753194170.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc550d125---dekimabuxibiti.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a2fb22442b184d8b5b0677e31bea69e4/61611165985.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/kuvaru.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d129168206---99828286494.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/2246772277.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce9a6296b---redozegewoxegap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=websites+to+watch+moviesPDF 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_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 17080 bytes
SHA-256: 86c7efb87152a5f4ee8bb6e179dc7b9ce40bb5c06c88848be1ebe1fd3a7bb2e8
font_01_sfnt_off000126d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 10528 bytes
SHA-256: 5e511824c835422acf6f076ba3f3bfa4534ce016f052b8cc90b3b504ab1739df
font_02_sfnt_off00013ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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