Malicious PDF — malware analysis report

Static analysis result for SHA-256 1966a192913d0e3f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 10:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 670d46ee5af76ac9267e605e6ad92d30 SHA-1: 7e9395169aeade7d9518aa0d82ecfbfe6b200194 SHA-256: 1966a192913d0e3f2fecb735e2eaaae2b3a179ad36c883170114d47306db5584
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the presence of external links and the overall structure point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=webstorm+shortcuts+pdf PDF link annotation
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d9f9d5509---77789869670.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/63026171072.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/96891814148.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/sadotusuzulipibuseti.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/wowagipuvenedoxavuvevuta.pdfIn PDF document text
    • http://fitviewer.biz/files/file/81786324636.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/darufefimo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e60d8b2331---8437330059.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/femud.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/fc0f505c0d684b59a1231bdeba44b052/mojirufinilibijejes.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c18c2867d---69353049320.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160920a5174511---63507082443.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/c93d5aab36a9eb9d5db42fad05abf5e2/75233699927.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/zazivexuvopala.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/96987043148.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/40202836798.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/rapazemakosoxelavozidisuw.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf71341ffa---90708585923.pdfIn PDF document text
    • http://aweibel.com/Photo/file/65081471185.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/taliposidiviwenatanol.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/zeladelixewuje.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/sewak.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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 10716 bytes
SHA-256: 7234ceb7f1d295fa04a793fdfcd91d723f75b7b2fd30559bb832509f34e22b4b
font_01_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 20572 bytes
SHA-256: c82f55e25277a5aeb756d6477ceee2ceef3ea82b3fdf5a923faa2a49a5225c00
font_02_sfnt_off000129bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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