Malicious PDF — malware analysis report

Static analysis result for SHA-256 505b9974dd1d828b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 18:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f13bed264aa6ccd99807f6114e37b18 SHA-1: 4a0df9a850d8818de61cb7d40e56a027b8604655 SHA-256: 505b9974dd1d828b7a60a8e385efaf8c47cdc3fb3174ca4fe3e3b8358a007a53
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://vivekanandbawwa.com/userfiles/file/32513483859.pdf In PDF document text
    • http://paillasse.hu/userfiles/file/55532259929.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0agsngtnnu7m494b60e3j5e522/94166208087.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ni56icmac7heduejk5qa7j87pl/48713391207.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/pimuzalelokodotiwuli.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/30077405341.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/tikelejudovejojoxujiruj.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f715eb582e6c1df70df7ee081151008b/89586211310.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dk5n2shokdj5vld0b8krefqcs4/josetezazogiduxedew.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/dobapo.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/rudibiki.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/puwirijikerifofuragu.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/01d68bf4857614678489fe582ecb3b7b/10980681799.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/860b4674d4e5fafdd1583ecd1d086a3b/60884835892.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/scp9envda725cdqs3s8l90dc04/40531472250.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fee85c47e292adc40a5d4a7d8c8c7ec4/61945341429.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/70f44cf1c1922ea44f728aefad6ebdfa/4353070783.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/sinedobemegemamujuzojum.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/dobugajemogamawilizokipi.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090413164473499.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/34537204718.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/zigogujezulola.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/somegiwijewozuw.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/c938d4ugvt538n77mk032orn11/fufifedekalajugipaxagomos.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/7cf9413338f8e3ca68f4443f61e2a4d0/58435176005.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/vojoduneg.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/87080038198.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7edb0d9d1f---35398791407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=relays+pdf+downloadPDF link annotation
    • 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_off0000d943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 10448 bytes
SHA-256: 018f83973d506eb3d57a0d3614a548d57f0da97b80640f6f562e376f4f53a9bb
font_02_sfnt_off00010942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10942 19480 bytes
SHA-256: 9de4caf9ca5a1321493534cebbdba16269a3f8fdbcb12f13763d7534306580b0

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