Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef3a371302987d8…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 10:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 299f56166523863ee2690db09e2c0a47 SHA-1: 7521bce76d010031be6925c8f8727f8fb6fd30d4 SHA-256: 0ef3a371302987d8ed8a0b4973751b32008f3c0f0c67f7a1f3792d13e52d204e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, hosting numerous links on compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, exploiting user trust in document content to redirect them to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160976675245a9---26813635122.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a2bd1312a---mujigu.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816c7d51bac---19313733242.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf856b2045---tatixupetunaxekoreweba.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a39bb80c5c0---sirejugidal.pdf
    • http://t-p-fortune.com/userfiles/file/xumenizi.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744e5530034---pamowonon.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0cb1ed6e---81754518584.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8f56e29e8---manesesonigozupunef.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/f2mtt6saufln9635aeju23uopd/fasanuzofex.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/qnhepn4uuuj8qhp5mt3nir6k10/99848137104.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076b2b753dfb---22189527678.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/68360668081.pdf
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/rizodotavifelipuvoruzav.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607054361d373---58366371650.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/08017934d914ad1533b52b3bc92528b0/2740748240.pdf
    • http://halaljones.com/uploads/files/2304429320.pdf
    • https://aglogistics-bo.net/userfiles/file/saxaxak.pdf
    • http://syuncyoku.jp/upload/file/kusomiramewakara.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2228a56e9---fokosajenowezi.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab08d9dd9---42266658653.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52331e5f95---sakofazi.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/65336864129.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/blh61uggf7aigrqh3fihqg607m/kugunupazirevokoj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+the+mouth+of+mississippi+river
    • 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_off0000eef1.bin
2843baf5ae427c6be7c5b6c4839290004fb544a1d87839ac3a089131538aa492		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 16888 bytes
font_01_sfnt_off00011ac3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC3 16792 bytes
font_02_sfnt_off000132da.bin
868d9c60518e8d91beceeda58be1a439925f3fc8e3dc23a83910a439c65f7354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132DA 10632 bytes

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