Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b8d7c900596c17…

MALICIOUS

PDF

85.2 KB Created: 2021-07-18 10:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afd45fcc2c6f9642e32da08cd125b557 SHA-1: 5e7676d6455601bd41bca7ddb2d618c8f8006be3 SHA-256: 89b8d7c900596c17e7436eccab7b4fe02436717137a961e2adf62d147f396e7a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves redirecting users through a link farm to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kaizenlife.com/ckfinder/userfiles/files/55169667455.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2d660077bb6620b2a2d55b418869517a/baxezunumu.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd0b41186---17645005067.pdf
    • http://wanyuantemple.tw/userfiles/file/ragugiw.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4da0f2050e---96108177816.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7ec10669e---rerororomidirewobiwituk.pdf
    • http://dongamold.com/fckeditor/upload_files/file/womivow.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/84bbec7d85c2b19c6841ea4a6c02c757/20759381303.pdf
    • http://paramountswimwear.com/userfiles/files/zijotupegejobiko.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1ff74976---wenokibetemorebu.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/abf2768ccb6914c75e849548c3c471ab/6689005096.pdf
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/susifedifadiwekazezenekif.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9058bcf6---jewepur.pdf
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/96431919901.pdf
    • https://genegurumiraclehealer.com/userfiles/file/surowuwunexolaf.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b22f4987c77---9898431520.pdf
    • http://www.emailposte.com/pictures/mogafelivivizosopamisuto.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/ffd924a1511408031a3b891630d6fca5/2557021489.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948d6b884e0---jaxovibugaxume.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/3b9d22e5ba5a48b8d98c659b9a31b5d3/fazodawax.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e187de6e---lunijizodizatifogolew.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+history+of+the+church+a+complete+course+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_off0000e903.bin
ae855d228afada6492fbc9306bd3f5fe22ed0eda3c74c8fe41c8af3b759aa2dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 17264 bytes
font_01_sfnt_off000115fc.bin
0577bd96a75da21bac4c75009618d3e9ecb1331ed46f03d894191fcf3213e806
pdf-font-stream PDF embedded font (sfnt) at offset 0x115FC 10956 bytes
font_02_sfnt_off00012f7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7F 16792 bytes