Malicious PDF — malware analysis report

Static analysis result for SHA-256 996c8ff5dcca38a0…

MALICIOUS

PDF

73.7 KB Created: 2021-09-05 06:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b4fd9b1fc955d7aaf1f7123b2150603 SHA-1: 49f7f3665ff89d42e42079f1c36c6f6616d94cd0 SHA-256: 996c8ff5dcca38a09b6559d8795e5f6d15fade07c12036a65a9963c617fb5097
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on potentially compromised or disposable domains. This suggests a multi-stage attack where the initial PDF serves to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://nomylo.ru/uplcv?utm_term=michael+vince+intermediate+language+practice+pdf PDF link annotation
    • https://hanyauntuktesting.com/contents//files/64877642588.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/nigigomesifedi.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/migdb8mnqu5li6gfq4logjdb3d/vavesuwadabila.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/tufokabovezaw.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/mapipunezakuxegawonosexo.pdfIn PDF document text
    • http://belst.by/upload/file/rizagazefo.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/fipudebu.pdfIn PDF document text
    • http://aven.su/userfiles/file/35045017732.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104a5997cf6f---nitafowovixufoj.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/82768890835.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/fupatebcmutr6uqkde510eg8q4/badidawodapexosuk.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/dudukabodigaf.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/5546013542.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/78197424374.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/14703927664.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/ae9fd0eac4026263887ecb4afcb28ba9/tubajinoginog.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bede4c98dfa60bd8497ff6cc80dba298/kukagumudosimawogate.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/f4c96fbbfc71c469cbd5938cb29aef19/16149545315.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/vejizesirirabokikaf.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087bbf2ac682---tefinuberofawusoni.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ce68a933e1---87919453093.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/pizojorewitopikojagafeguv.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/banurinojonifi.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_off0000bd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD71 10936 bytes
SHA-256: d7514015a08a9d91304459397bca5661f63cdc9dac05c03fcfa0710aacf8cd34
font_01_sfnt_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 16352 bytes
SHA-256: 559fcd360953425e40d553f01f69e890af83980e221781304cebe8f5d0162b30
font_02_sfnt_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.