Malicious PDF — malware analysis report

Static analysis result for SHA-256 acec19e985110bb3…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 05:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8ab7a80dd75c526ed587efe6b7e7aa7 SHA-1: 5b4441586e6390f3abed49a7ab95ebc561ebcea4 SHA-256: acec19e985110bb3f79d9658dd3a32b9fc694ce6e3e17e613d4d0eee44a90402
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a spearphishing attachment as the likely attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://laborke.ru/uplcv?utm_term=quiet+place+2+online+stream PDF link annotation
    • https://tectrongim.com/uploads/files/bunifusariliworexu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423c5aecf65---rupezexazufuzovepobigurat.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/rujivumopofusawesoleniv.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210906_145934_100.pdfIn PDF document text
    • https://okazionche.com/files/20657143979.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/likipoparefudigobuwijataw.pdfIn PDF document text
    • https://themalc.org/files/file/porodikexiz.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/nujorid.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/seviked.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/61907835923.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/83152854282.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/pojuxaroxogexulopakemupix.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/jidimulupejo.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2cff3a568---zidogutim.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/lopew.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea40c935a8---pubevun.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/babiwiwemixajasejujibuvuv.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/48179359738.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/97075601756.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/sawenanotewaxu.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/judumufivodabipuwepupo.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/gafizetesiwobul.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/lefososimosaduxukupizomob.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/sogimavogowawikegajog.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/nuwegewozofasubonojorune.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_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 18252 bytes
SHA-256: 2c3c4c41fc2068e4490563888e85adcda96fb9227df6ff2d2a71fe3818428f76
font_01_sfnt_off00010f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12782 10812 bytes
SHA-256: 1a5adc1f5d3999eff2223df7d1fe9a0413ef7220bd372a11bfdf6fc9962510b2

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