Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62e2ac5dd2e6719…

MALICIOUS

PDF

94.4 KB Created: 2021-08-30 10:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 73758c62eeaadd8850c43ec59167af2a SHA-1: 301c88c654d5167a4c3fdcee6e5bd1cbb70a4f51 SHA-256: a62e2ac5dd2e67193e3b910fcc6f7d8d7f82b10dd255209ec6c1262ed5b51827
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malware or phish users. The PDF's structure and the presence of multiple external URIs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pistant.ru/uplcv?utm_term=dnd+5e+druid+circle+of+wildfire PDF link annotation
    • http://axiomestates.com/userfiles/file/wilekuxaduxuz.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/fidabojewovawediti.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972d5d41b41---didoki.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/wekip.pdfIn PDF document text
    • http://potlista.com/file/files/37505350997.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf96a078028---93582882633.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/roxukonepizewubaxekavavaw.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/17374519657.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacfff1f0a4---lodomerifukuborepukopoj.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/10fb62326dcab760f494f4e559dd7693/50571399973.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/97956515617.pdfIn PDF document text
    • https://ocw.tw/uploads/files/28358878277.pdfIn PDF document text
    • http://iphysiology.ru/upload/livaxajowawipukut.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/87720306297.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/wapojasosuzinesidabaj.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/2831913196.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/pr0ei8lupm6rg9otgqbg09vkoc/xobidag.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608826af2a83f---39141812210.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160860edb698e7---regakisixaxuzexafozi.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/97030052522.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/blvi8dsgnlf9o828rq4uq5r0c7/95394412529.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17e63370a---85657254985.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c64e79caf---gadud.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/kisafugesafuloxorure.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_off00010cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EF 10360 bytes
SHA-256: ccefc815d659a163dd0f5e3e5402d3070aaed2af9254127c95b14b88a5a42d88
font_02_sfnt_off00013c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7E 18176 bytes
SHA-256: 098347c49cfde617a3e265494ae5abc64478472685b4094dc8d83895d42fe57a