Malicious PDF — malware analysis report

Static analysis result for SHA-256 908d96f5c230db19…

MALICIOUS

PDF

89.9 KB Created: 2021-08-01 21:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4bb3210f05482dc60016aee98f013ff SHA-1: 4569adac6cf88033667206c7f845e2cd7e33041b SHA-256: 908d96f5c230db19bc06ae9b3255bb901ea6270771d69b831313567a5c76452e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=what+does+tammy+eat+rick+and+morty PDF link annotation
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735a25af76d---gabotoxusigejalu.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210723_183001.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609834575f96e---39366402599.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/g5arespbfpm20hjgglqrqus408/71009711107.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-7-26/20210726181307832575.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/94480417520.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d4af21a0d---majuzovokimipubomov.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/16093504374.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b35c2c3509a---sizalaxagizojeraxoluletez.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/kilidozoretarazuguveson.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/ravaxenixapufure.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609611f041320---66959232821.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/j1h4t1a1s8kqa3qpteu4q7icfn/96389957748.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/47479934422.pdfIn PDF document text
    • http://expresskaliski.info/file/8512228883.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd9f84545f---17270203211.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/nebubusoba.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c511ef697e2---34746896078.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160842eca11287---fusovu.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/76446242916.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160fe87687f533---bunujigigikidenugid.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8850bfb1---42757468791.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/98733181821.pdfIn PDF document text
    • http://starsunited.at/upload/files/nipemodikuwewuj.pdfIn PDF document text
    • 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_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 19204 bytes
SHA-256: 53607c5d8cbc9b99aaec3bc78084d211cf2c7ee280de774974a7edd3fb5e3c66
font_01_sfnt_off0001293a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293A 10788 bytes
SHA-256: 01612e0ea382b098e42bff4c8a250c6232d2d117e52c63ee68f6b74f73b9c439
font_02_sfnt_off000141f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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