Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b99f70164adaf3…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 04:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d4c206ad57b9115d52521ad3af1732de SHA-1: b04f2499acbc382941e584ddc30b00b82cbc4ea6 SHA-256: 32b99f70164adaf34cfe79bc7e651a5ccd096e32096bfe536ee9599ba6d64880
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of numerous links on potentially compromised or disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://philabc.ru/uplcv?utm_term=boy+names+that+start+with+ge PDF link annotation
    • http://campcolefamilyreunion.com/clients/82065/File/dajetosuxabivoj.pdfIn PDF document text
    • https://cargobull.cz/res/file/2386329347.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/kojipagekozepudu.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/83398772881.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/8cd7f71975ce6b52fd413683ae4bc8f9/kifemukokabokinafefuni.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/diruremozizotetalatuxesej.pdfIn PDF document text
    • http://multifamilyfoundation.org/clients/3/38/38c33163524538bb895552046de0b362/File/fisiwasedek.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/gudewipitinewaxuzazikabat.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160884a489e3a2---ridefatakikunegovabubi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b38eca190ab---rolofomewubepigew.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/9176984901.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/rqdfhgg725eds3orm1qujaea94/44466032355.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/cc9a812610f8bc2d11ced8c8b862877e/58341023188.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/82759065861.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c0be3ddcc10be646c0d594c71e3bc195/xanujeguviwolasemav.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/29030806705.pdfIn PDF document text
    • http://aven.su/userfiles/file/fakexabikifijorezeku.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/gubig.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/xejawipatu.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/1046540908.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e974eadf0---8559444290.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/97866419fc62b0815cd97b22c0c4aad5/pimaretamubive.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/66525d3fdf39be1e8b07e02e3f88f122/linikunimop.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/kogexonedadegososo.pdfIn PDF document text
    • http://splogservice.ru/content/file/77554689451.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607792fe50dd8---badutaxewapimitux.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_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 17856 bytes
SHA-256: b014bf3b7b9fe533bdf7957d84c1061db99354f8519df22049c568375ebdc42e
font_02_sfnt_off00013201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13201 10764 bytes
SHA-256: 1cd60bc4cf4e40ec983573a378350e195c9df925d1750f52a7a2248d39ef81f0