Malicious PDF — malware analysis report

Static analysis result for SHA-256 43539a2b54f52eb8…

MALICIOUS

PDF

68.4 KB Created: 2021-09-05 04:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51bd30d99b234dae8eb91a259fe8f899 SHA-1: 0e2cd25f6e3fe56a5ca929174510731a77d970e0 SHA-256: 43539a2b54f52eb8cd643ca388bc9482504fb23aac88b9e11c9ca6b8137dd6a9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The document is image-heavy and contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and link farm indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 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.
  • 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://avenue102.com/uploads/file/bixetekevibepi.pdf
    • https://foodphotoshop.com/userfiles/files/80080319295.pdf
    • https://airshow-bg.com/file/maxipafuzuwegirabikawul.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ad223ac3c7e4ed16cccf4d72f56a9fd2/37936148157.pdf
    • http://iproperty.ae/userfiles/file/pogepizobekotusurida.pdf
    • https://basisangka.com/contents/files/fixiginokoj.pdf
    • http://tucholainfo.pl/userfiles/file/13728965585.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7be5502f95---kiwurewegapu.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/fd1508d96ecc993b63183af516b97fa4/94796743457.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/91484666607.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8105926811f1e933af1082d0fa13d342/77808840881.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c4b1f0abc---batilulosubawazobakop.pdf
    • http://paolacaone.eu/userfiles/files/busokamopefetapodanimeko.pdf
    • http://jevades.com/aircraft/fckimages/file/bemozonuj.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf0aa5753---rekivujox.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c33457748---19232580616.pdf
    • https://asthasupermarket.com/userfiles/file/jubumakasurulab.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2b8e70784b6c84dd7fe8426121317f1f/90855754694.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/tdnu39e70plaj26g13fnep7l1d/fuxagalekeperimurifuw.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/3bb8d070b37bc6e6d1a04286728940c3/bodesoxukanijoxa.pdf
    • https://e-fasteners.eu/media/file/77633088335.pdf
    • http://amandatravel.com/userfiles/file/xolidivupuxojolupimos.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/kaduvudogi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=imagerunner+advance+c5550i+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0a5.bin
a17bfd704368a5bfb08c6d0eb6f2c327c33d73f96e588d57b9eef1ea62044a56
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A5 10700 bytes
font_01_sfnt_off0000c8f7.bin
6277fc9d33e55d1b3d9b8d7b82e285cc1fd6271b5401adc00edc253f60f0b841
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F7 14468 bytes
font_02_sfnt_off0000ec82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 16792 bytes