Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3dfa2d79cc1b418…

MALICIOUS

PDF

105.1 KB Created: 2021-06-16 08:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 55b893fb62271155babb69469ae628a8 SHA-1: ea3d2af0116a6b03a6edda25aa14d028039db5ca SHA-256: f3dfa2d79cc1b41817e1b43b78389c0bf3d1aacf194da1102f3d4ae4c0cfcb0d
156 Risk Score

Malware Insights

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

This PDF is classified as malicious by ML and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware. The document body, though heavily obfuscated, contains a string related to 'Autocad shortcuts pdf download', indicating a pretext for users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=autocad+shortcuts+pdf+download PDF link annotation
    • https://sportsht.com/userfiles/file/kipepe.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/melalekalomela.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ba69e3b8d7c488d1790eccd61bf59a47/bamawixavejusa.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/45f40b160621bd46be8e519a10f347b9/61017960233.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/zukekepefegakutimapuzaxud.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bdffcd09d---rugojinefiriwexulevepujud.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/17265k2a49sksga4da8o4pgsh0/30240313066.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/metugewozerejazunodoj.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ug64fb571j6ec12su9c9ja46md/93350344413.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/wofutozakojipasorudusej.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8a0d568ec02b17f56fb323ce9940fb6b/valajifibudoxabofanokixu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607712a2d433d---21632432808.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/qof4pjh43hl6iv0c282fs7l3al/pakalilaluvinikaxojopifes.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e323ee40f---velovogasufetixuj.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a59c98d4617---ginotedu.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ed79ebb2---13801408535.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/96607540920.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_off00015efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EFD 5324 bytes
SHA-256: ad3cb6e07cbd089200906a2cb1cbc6ef53dab07f73ff1cb9850efdcb9e52797a
font_01_sfnt_off00017126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17126 11188 bytes
SHA-256: 297749c11ead3313b4da7f8ccfe53116cc8076e77ca55d7c0a9b8298f7c0d735