Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f25814b6858dec5…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 17:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 31e3a8c70ba41a6d48784d80179ba128 SHA-1: 796cbd94ff6ae7f9bf38d9c6be63547f95561843 SHA-256: 8f25814b6858dec5d4a4c2a84952ed49a3217884a3f089875a685d3c957f0a68
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm on disposable hosting. These links likely serve as lures for phishing or to distribute further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://pmeds.us/userfiles/file/55586272143.pdf In PDF document text
    • http://neteyes.eu/editor_up/74859544095.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/54526874621.pdfIn PDF document text
    • https://unosms.us/userfiles/file/53410846315.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeef9ec786---14790413349.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1e30235b---ratilejebibugubuwi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612d802bccd5a---16924194153.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/zokenitezubofeja.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611912eaaa8ba---85418678282.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160ad53f2a7563---bexakodesulugud.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/witubozomoga.pdfIn PDF document text
    • http://tion.hu/upload/file/luwagewemoganazom.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/64219728025.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/27751494359.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/739vl68tukk03to284soc74cj3/43178525206.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/r18vo695g7dvmhl4kpfmqjd2s0/nexukuzetozowesivukoroxo.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079e7acb8f54---ralisegatudisakuze.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160db32c5cc4ca---kimenofuboj.pdfIn PDF document text
    • https://watertorens.nluserfiles/file/lodokefivofabokure.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/dp6iov0aladkj9jps5tu8h1gaf/bikoletafezala.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075389c5c00b---79707429885.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/zusitujuda.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee4a1a8ef---16825787868.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/lebodexujunanabonigo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/uuc7r36judv75t7u527mr1us13/mopubidomodajatofadokem.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/xodinon.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5a521c9dae00c0e4d61743d7b97520c3/82244698093.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/kafevuvedisafufiwun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=unscramble+sentences+worksheet+grade+4PDF 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_off0000c61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61B 16568 bytes
SHA-256: bbcca1aafce668d82f51d20831baf1146310f8514a264c41766fac4ee570d4fb
font_01_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 11128 bytes
SHA-256: 5b1fbe69036df4643e0961a96d229eb1640da7eb3ca86eaa6435319ed56e0697
font_02_sfnt_off00010ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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