Malicious PDF — malware analysis report

Static analysis result for SHA-256 457e105d1fe35640…

MALICIOUS

PDF

83.7 KB Created: 2021-08-30 06:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53dd22925ca12b388e16281fdcfb07f1 SHA-1: c797c2195519b88130c9605b9efb4b5b1bd16b04 SHA-256: 457e105d1fe356405dafb5329fa4f069f5c031ce012d5276b27ce2f7f0a84143
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of multiple external URIs indicate it's likely a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://qianxish.com/ckfind_image/files/wuwaj.pdf In PDF document text
    • http://zulaikhatextile.com/userfiles/files/binimaxof.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/40178118098.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/2329574694.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/380fa074fc68007f51689cb73aec883d/55327901954.pdfIn PDF document text
    • https://digiconelectronics.com/media/neximarekawekubefu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c0f8ff22bf---89070581681.pdfIn PDF document text
    • http://sgpeo.pl/users//file/puxoxujamirex.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/94916065597.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a96f197ea7---vavatipexad.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/logejiname.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/dofisoxu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161264d4601704---sonukuj.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0db5ad6476b705a374d2dde1fea879d5/82252912604.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ca7930212fa1d7c06fe81f61a2a65f0b/65262472610.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/78716139604.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/68943453117.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7289b4bdd0ebe03b6a155a4d62ed8c3a/zifireje.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0cd8482ea---garilidafexebej.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959aff3dc78---fevuzekaxubumijedo.pdfIn PDF document text
    • https://campermagazine.tv/public/file/3543284080.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/18194755866119955f052a7.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/abo6hrk1gj2u53ohgvk48mh410/38985810633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bloody+boogers+babyPDF 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_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 10436 bytes
SHA-256: a20320e1de79b30ed0a4f0261a40f1d52a8089c4b6475d56409991abf2a10045
font_01_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 18272 bytes
SHA-256: 5a71a3f63c7103dd7448a0092a2ad85093f9b9851286399976605612b05d3227
font_02_sfnt_off000128e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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