Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81ccdc566e7b916…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 16:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a964ebe9d2c34d2ac04f3fb4165bedb SHA-1: 76605889a183e9cf215b503a38e6cecbb0485d9b SHA-256: a81ccdc566e7b916fe57c655c4b136417752982b7ff6800aa6c963acb8a25473
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the link farm structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=alv+form+pdf PDF link annotation
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5529abcbc76251e731dc79063bea8c3f/zepobebukefidizimugo.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/xilobegapu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/789288b78f4b52b8bfa6bbd5a484dfd4/fosusewonefituxazagugomif.pdfIn PDF document text
    • https://unosms.us/userfiles/file/mevidakobanuleka.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/gavininive.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/67183900800.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/92055520932.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/kenezinijupiwe.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/kigabopavumir.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/79476632257.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4ra07dhs00jf6lavgeb8ph0e40/80717276481.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/1196342297.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/zulozokimigu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161152f785d39e---84786113932.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b22ba4b57f6---94947861394.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160985fb32d1b2---fudodumevisomu.pdfIn PDF document text
    • http://elitvorota.ru/f/file/6639027023.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/mirapexa.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/kagegopobatun.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/mojuwelanamiluvobaxov.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d7cde84eb---jivigikozazaxu.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/tavozixozaregezaxuser.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/75156108436.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16117d7d1e8b4f---ziledixeninebafenuwafez.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_off0000e266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 17796 bytes
SHA-256: 7de31644b5846f2ecbf805d7b1c2d35689654b36bb3258f5f9c5d0e88208597e
font_01_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 9948 bytes
SHA-256: 5024af6bb542dbeaafa543409f9843c0c00f36ec6a988b973c54f5c9011bdc89
font_02_sfnt_off00012758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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