Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6934521efd87afa…

MALICIOUS

PDF

75.7 KB Created: 2021-09-19 06:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0def7eb8776cbb6984b12b399d17b0a1 SHA-1: fb6c72d547d56339a3b68c3011e040e4f942473c SHA-256: f6934521efd87afa4c4796612ffa5b0155e2446437d4bbf5bea328808b69702d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. One URL, https://pixomot.ru/uplcv?utm_term=the+seven+deadly+sins+game+android, is particularly notable. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely serving as a lure for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://pixomot.ru/uplcv?utm_term=the+seven+deadly+sins+game+android PDF link annotation
    • http://pm-ural.com/uploads/files/51400070616.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/87712323823.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/26244759607.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b185e0361b---2873293452.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/72995877263.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/giganixe.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52032035556.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/70283004356.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/jomatuzuwuv.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/kns32us1n5njm30epksje1cm5s/88229290666.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/sofopilofeni.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/robugufaparuzusilefanas.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/jefukabokutawufuvefis.pdfIn PDF document text
    • http://turnyras.lt/Files/file/xalemolam.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/93908576475.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/29876141124.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/20917734028.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/49712827119.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/bovezesugo.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/roluzenasafamixu.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/jeson.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/wovagobek.pdfIn PDF document text
    • https://lasanisports.com/files/xukotak.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/23621626978.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/tubowi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba450ea571---pujazuwutiponow.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/dadijisomutidawuzaz.pdfIn 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://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_off0000c361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC361 17460 bytes
SHA-256: e4f97f092d9dcc4a4ad3fe3179e3de323021998079a9cc935a8126308b25cca0
font_01_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 10740 bytes
SHA-256: fc83aebc0c545accf12809ac549f06b5239aefad9c5a796abe7d5dba732c3bf7
font_02_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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