Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77ef3eadf1b8bd0…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 14:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 251dd1e72a1f3ef4e58cefefe3cd7990 SHA-1: 6c5e2ce87609b8190e2e57337c6d32aa8b2abca9 SHA-256: f77ef3eadf1b8bd00265600e787ac769370cba32e7c8050b0e8969d3e49d6334
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=fruit+basket+another+manga+read+online
    • http://freetourscadiz.com//ckfinder/userfiles/files/2631034547.pdf
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210610_C45807F48B65F463.pdf
    • http://czapla-dachy.pl/public/images/fck/file/92678497808.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/edf41e53623e015b7de3bbccd7b593d1/bomeresesorapapigamagej.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b661b50d047---diwufadaza.pdf
    • http://kartywspomnien.pl/uploads/assets/file/voxebuvirenarufe.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef6c1dc08---sunujasolorujona.pdf
    • https://africanresearchcenter.com/userfiles/file/46149028416.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fc61cb57a3c7c9d2c42841dc82794b78/xijivepozinemelorawemi.pdf
    • https://home-consult.lu/userfiles/files/govufo.pdf
    • https://soudurelauziere.com/upload/editor/file/dorenef.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b11afc16a760575b003d3b73b6188179/9057950135.pdf
    • http://artside.org/data/temp/file/99100085043.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210519100934.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb5d5ff68---ziximewewof.pdf
    • https://nezrenpin.com/calisma2/files/uploads/kofiborofitu.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/bk393cigfjubo8r9c8qbe6ed4b/xofogabexofopukunep.pdf
    • http://ahkjt.com/upfile/file/68123709627.pdf
    • http://plastikacz.cz/soubory/files/fubopijafibebi.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf451ea5b4---xamuw.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6c7ab7f79e90694d8e1e30beb68a271c/totigejobe.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f747fd898f---fexuwojarovivurido.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d716c5fc---damovunonutizad.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096e10834d15---pofenagagetevameworev.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_off0000efc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 16792 bytes
font_01_sfnt_off000107d8.bin
c19e91f6a53d631fc876d98f8dd174d61fb4c29b4046a4fc26a14141734e1699
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 11004 bytes
font_02_sfnt_off000120fb.bin
7fba25943a22fd3866c88ee9fe0dc8d7484bb80e695da71aef3901471a9fa409
pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 17672 bytes