Malicious PDF — malware analysis report

Static analysis result for SHA-256 33796b56b5c091e0…

MALICIOUS

PDF

74.4 KB Created: 2021-06-09 01:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d51e785ec951df0ce5e43a8f896be96 SHA-1: 6261395201941dc8b63680f614b18b6db64d7d5f SHA-256: 33796b56b5c091e082bc93487b9413c3ddd2baa045c7fbcc14dd2edcef60a964
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 https://queure.ru/uplcv?utm_term=explain+any+three+qualitative+characteristics+of+accounting+information
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/pu3sv4c02bmhm06n0ph33lh1j1/natozewujilifit.pdf
    • http://gtshotel.it/images/file/sisokonigolifikolop.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4bbe1e555be7a3442678af0126c1d733/72834077699.pdf
    • https://alnahamgroup.com/userfiles/file/dofuzapo.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bp1e355dkq9e51qfl7e48n0gf7/84392806659.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7c815c238ff622923468e9f030df3f45/59704647654.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607decc16e2ea---5899789711.pdf
    • https://fentesmakina.com/paket/upload/files/jipojiwivezomez.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a284e206dd1---80521989001.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/gilefaw.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee454010a---fusejatokit.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/718d9b04f87b4b13d6542978036a3392/88938858694.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce95461e92---71644287704.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160721da36f216---49811460158.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078625616e6e---50967075647.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3c949ca8f7b5835ec477ea9cf1e14a31/29041640111.pdf
    • http://nfc.soo.jp/file/zetoxosubuwowowoxakowo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e231.bin
436b633c6d81dbc89eddf6f19f9144fd9e01caa6c70cc2e320c1007ea314350d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 5744 bytes
font_01_sfnt_off0000f5a7.bin
22615c418eb727927d7832e48be7430aec84c75a819dd9e2357aad33883962f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 11244 bytes

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