Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a314481313fb25b…

MALICIOUS

PDF

98.8 KB Created: 2021-07-04 20:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 125811a97d467cdfa432995a518e12e3 SHA-1: 3d89c282f2ed15526457dcd4aab75f6734cd6739 SHA-256: 6a314481313fb25bbdbb94eaf03f7f84e5e04ff2ba6df298b8cd6251fce0beb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The file contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure strongly suggest it's intended as a lure, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://chcial.ru/uplcv?utm_term=back+to+down PDF link annotation
    • http://beastyenergy.com/userfiles/file/duwijopobotadesiliz.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/v2uri4dui1sifmt1vb095cm698/29064229912.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e27e534ee8---tubujipixebaraguzu.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/22510390269.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/nabijunazevigotakejisit.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/lmhg63bbkp3v6e24lo1apolmkm/41474178068.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/titijofekekidununagipijad.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/0e1b23569d81b19876437c05c7c4502a/fevafogidumoridaxodixup.pdfIn PDF document text
    • http://myredm.ru/uploads/file/20272149321.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/61a7d56bf3c6b83abe062f72b80a56a7/sukekajafufelutazodezavo.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/amafafaruxofurikazewaga.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d124bc4d5ba6bd00981c2be4f511f972/94916816210.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/24913215832.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/78cb5bab66bf3e14915b8258e62c698e/23260511413.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/25574130878.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec61d7964---84598190437.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/19222712151.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0d7c83a9d85a3b324e972d4be85e38fa/kedox.pdfIn PDF document text
    • http://bscartridge.com/pic/guwigeret.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/tebejizotuketu.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/75136005122.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/80149147693.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_off00011d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13582 10056 bytes
SHA-256: 1595d19e6e9136a760e72b4fd5689b4662fceac2e8e5c5a3c7e5cdbfa6e5272d
font_02_sfnt_off00014c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C21 18524 bytes
SHA-256: aeef501239d1e8d01726ab1841f4fe4ed7e7d80153751eb85a83cd5fa022d3d8

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