Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd40fcf956d76c7…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 14:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17159640ad3dcd9608a5337ab95855ab SHA-1: 9d07388471bb74045707457f84fcef172f7f1344 SHA-256: 7fd40fcf956d76c78cfda9debb5b7024151998729905c62cfc87b56c019b6efd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links to external sites, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The document's structure and heuristics indicate it's designed to appear as a legitimate document but contains hidden clickable elements leading to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://affordableadobe.com/ckfinder/userfiles/files/pidupot.pdf In PDF document text
    • https://hashtag.school/userfiles/file/foworixiwis.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/lavukesabuwapubola.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16145023ad8dec---51302304416.pdfPDF link annotation
    • http://euskararenginkana.eus/files/galeria/files/ginofolebotobon.pdfIn PDF document text
    • https://blogsma.com/files/ginoxularezomilotaladi.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e9830d9c85e065a46c40bca6c64005d5/nalolutisukogel.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/gefizexazirebabe.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/dotavejanawuk.pdfIn PDF document text
    • https://tpk-m.ru/files/file/63619998863.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/kibitagetazenuw.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/dabcad58d3ee4bb7aa002376bcce181e/36809210567.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/bizunejipisaw.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/27202130010.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/tupuvasaledosapuzufojux.pdfIn PDF document text
    • https://aitalk.vn/upload/files/jolerakolivopubaxorov.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/46065201359.pdfIn PDF document text
    • http://pnalog.ru/images/file/92123654503.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/dunefurovanogab.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/dimuna.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161410f23e4b8c---kinodalodaki.pdfIn PDF document text
    • https://mavibusiness.it/file/dikid.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/2334811538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+developer+fresherPDF 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_off0000b214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB214 14612 bytes
SHA-256: aeb735cdbd04ba70f6cc1444062270e583d190b4b9afde4366e1b393987199cc
font_01_sfnt_off0000d5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E0 10380 bytes
SHA-256: d81ea57ec966d670753b73a6facf51843f44b079aa326c27f2764273bce39dbf
font_02_sfnt_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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