Malicious PDF — malware analysis report

Static analysis result for SHA-256 821cc16cb811c7b9…

MALICIOUS

PDF

90.0 KB Created: 2021-06-29 06:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ca83a39358a0e69bb09117c41329c07 SHA-1: 21ed1d766b329adf095edd0fafda3616d58889cb SHA-256: 821cc16cb811c7b9538a067d28273d2aed9ce6446028d9d56464001fbf41b337
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or phishing pages. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=pietra+firma+luxtouch
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/v1gp4f1jdro5qcqurvlv6nv7q4/61998896549.pdf
    • http://jfkanacon.org/data/userfiles/files/xomefezexizifavud.pdf
    • https://bloomland.com/sites/bloomland.com/files/tebedadabizexevod.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/25009d68f8dd38803019e9b4e97e5a06/furamiwivip.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/t7bbe0lnj2rqelr70m232kf5b6/jidirubifimapek.pdf
    • http://botosani.ro/img/uploads/file/pukunosifapado.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/11a3c3b7caa18abc49ec0879b539a6fb/62410683782.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6ff9ed11f316406d665870b3b847130b/kasefimot.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/0bb476c1bf71073a04bfb91aeca7a87f/wawogumofuposa.pdf
    • https://andhimazhai.com/images/files/19074466627.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a3f7a543---68154041722.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160843a473af1e---8084806901.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/2249530809.pdf
    • http://centralgiving.com/media/userfiles/file/vitikisinid.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56cc21ec2b---raxowulugobovagut.pdf
    • http://casaatlantida.com/userfiles/file///33285876294.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d926a01ac85---votugulibisilemeveraweb.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9447177de---zonowup.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/66913b5bf117a623ec266f9de484f9b9/29244678157.pdf
    • http://ezibra.pl/upload//file/mejezewepobigulinunepebof.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2accccb506653dbadeca60da96bce19b/sibolidekodofogakukutis.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ovg0fgfjqagivvsd38h021oh33/dikejigolazitid.pdf
    • http://cupta.org/userfiles/files/20210605200350.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_off0000f3cf.bin
c69957480c8c76a949ac14a01a664d032eb9e356e79f945bfedd7c61da58b25c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 25076 bytes
font_01_sfnt_off00012a91.bin
843d12a1a7cd9d24dca6ca04c2c21f77aaa0d292a15f3ca4223b0f5a23262ef5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A91 10532 bytes
font_02_sfnt_off00014295.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14295 16792 bytes