Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c0c5798a4e80dc…

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 22:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9ee159a6d10b4b127b85470abb4d28f SHA-1: cd2eb66757b16ae842438371e639f0bbedb370e7 SHA-256: e5c0c5798a4e80dcf612e9a8fbad831d05280abd05b9a8fed6270c46273debee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The presence of multiple URLs, including one with a 'utm_term' parameter suggesting search engine optimization tactics, strongly points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://coretry.ru/uplcv?utm_term=justice+league+snyder+cut+full+movie+free+streaming
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832d7b910d---44898967045.pdf
    • http://epoxidice.ro/mm/file/godagababorafamajozi.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909fa933ad1---xopiwidu.pdf
    • http://tlxzkj.com/uploads/file/182121153807.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac12a7800a---11617754848.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/46fa3ab264aac4d59da44f624a9722e5/difafop.pdf
    • http://wintec-samu.hu/uploads/files/kazuwemowukuz.pdf
    • http://aucoindeshalles.com/menu/file/vuxakogupapibokebasaz.pdf
    • https://etonbio.com/newsLetters/images/file/guzarurofanawitive.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c46ff36ff80---lonisofak.pdf
    • https://olterus.com/contents//files/50370576873.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/5ed18c35ac5snnsc25to1df6us/29194734524.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b39bb4c4a---molefefagofu.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/170931388147.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f1aafc5c26b18455d5d0b9398446c34f/lufitinixinevanefife.pdf
    • http://adabaskimerkezi.com/upload/file/49798146544.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9acbc200---sagup.pdf
    • http://www.asslar.de/downloads/xedisewepagisor.pdf
    • http://eko-inwest.eu/upload/file/gegolugalumiwufezilasak.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607080103310b---62810861663.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16083b684e27d1---tuzinoladaxul.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b9248665c78c5cc40ec2a56d940249ab/58090786762.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3481261b63acf7fa57ccdb2d223ff9a8/20549147000.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a84749ef0df---56283558260.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160864e5da5aad---89280032204.pdf
    • 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_off0000ef70.bin
78b92df5157e8b08bb06202e6308426da01335d847fd8548db756665cce5a295		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 17536 bytes
font_01_sfnt_off00011d82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D82 16792 bytes
font_02_sfnt_off00013599.bin
387f06056bdf739641502f5c559a8e40c6b8cc5c34125c25b380572864d46c74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13599 11092 bytes

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