Malicious PDF — malware analysis report

Static analysis result for SHA-256 3644b713e0d91716…

MALICIOUS

PDF

103.6 KB Created: 2021-09-07 11:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85b1eef54468a55b9f7c4923ca9defe7 SHA-1: c76fd61925bf8397a4057799e4b7af720a3feb76 SHA-256: 3644b713e0d9171620275610cecebd964e81ca01d155954a5a2356f987ff7a3d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa3f55b3a6---guniwewupefovalexajus.pdf In PDF document text
    • http://hasadtemizlik.com/upload/file/60444657010.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6fa6fb73---82219573047.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/75688166064.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/87bq11940pe06e9a1qm32bh538/wosidurazusaref.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a09a308c35---55158346024.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c23f97b0d6---89101859574.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/pidupuvofurebafigefuxuw.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a598761d487---85676765610.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f2bda2b64---kujolufomogemosodurajif.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/1933942416.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c389e3d230cc19d932834b2b1ae3a969/muxigerojaziwivoforanun.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vugisadejonuze.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/78153306840.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/74f1c9f8or4vbfpq9ut7isu6a5/5061950446.pdfIn PDF document text
    • https://seerupit.dk/assens/file/97011805072.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/32339149707.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b2c84d0ce---74719114385.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/60085689787.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/60329101291.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/509ed8daf333786b3ba96d8dacf659cf/lunoxo.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/faboveji.pdfIn PDF document text
    • http://firegallery.ru/img/upload/besuzovuxuluf.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/54482288886.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/61731941226.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907452e06b0---lijiw.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/60723446795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=car+rental+lease+agreement+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_off00012d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5C 10660 bytes
SHA-256: 2666ce1e9cf473d74a18acebc2b9de66ddf353720faaccb38383569881b602e8
font_01_sfnt_off0001458f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458F 19584 bytes
SHA-256: 31db716f766cdba1e168bfc0e1ef7b65c0c52bf2cd4a9708b5aa1e32b6c346e2
font_02_sfnt_off000178dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.