Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3174bef8d6bd98…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 23:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42e10f9bac57d9c5a96eda588065a9f2 SHA-1: 015111b16bab122bb4117230600ee962ff0eb8f8 SHA-256: 7c3174bef8d6bd986349a5df94d757c91a25ac89c4f2f93246867a28e1183e10
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, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to various compromised websites, likely intended to redirect users to malicious content. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong intent to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://zetrade.cz/userfiles/file/74449374308.pdf In PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/44086614734.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///bexonuzamalolaxopo.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/gagozasudironizujo.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/359e54ed88433d016018bf7ed2e46207/85520928059.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/miwewamotiworolidafexi.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/xakuxuxosipoponorujarum.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jinofivuwogegimadukilo.pdfIn PDF document text
    • https://purefeeling8.com/data/file/83187937217.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608151f3a662b---46010711168.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210511050806.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/kowutefixexewusonuv.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/718253532.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/92351895681.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/sosen.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/vebegutorada.pdfIn PDF document text
    • http://midospa.com/upload/files/mosinufeb.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d852e2709---dekaxewuba.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/gemodigulaxotevapozezofol.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/49378851271.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/kujuguwaximenipamomaji.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/keguxunemifururiwire.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/98851071933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=assistant+manager+resume+pdfPDF 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_off0000d338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD338 17796 bytes
SHA-256: 8dc4fd7f2e34564a98f2b2fff44a585b64aa831937ce7c6b30fc4a7bb7ecd51b
font_01_sfnt_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 10756 bytes
SHA-256: 6eca703d27792aa8bf192ff66c2d20abe791d52e76c464575f3ed534a815f3de
font_02_sfnt_off00011987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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