Malicious PDF — malware analysis report

Static analysis result for SHA-256 caae928149b62a73…

MALICIOUS

PDF

92.1 KB Created: 2021-08-09 18:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e54f2929900710c4e3e5b81d65ad19f SHA-1: 889d84a2529c6d25b63b96376c6cf2d0390d7f83 SHA-256: caae928149b62a732e89e7fa756c45fdddffc4eb6a9274340e208d771f045d76
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://kronikarp.pl/ckfinder/userfiles/files/41607145062.pdf In PDF document text
    • http://siripanyalamphun.com/user_img/files/wivipexefude.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca86a79a32a---10956744151.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105758b35087---37990005214.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/vutetumagojafezigatuli.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16094cae3e46fe---71867638021.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/mitum.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/zawujimovagobev.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2a73b6823ba718490d18908f11025de6/59600639068.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/53968784700.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/22563577158.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/29610b5b6915539de99f8465f0b64168/wanapi.pdfIn PDF document text
    • http://gonuldoviz.com/upload/ckfinder/files/10529784472.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/716c2a7ed1fd8abb32e7ce52a6fe8fe9/82476973669.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/62275791953.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/262661df700a198a5be4671d3fc53aa1/purox.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/zetesawoteximewita.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/42590177952.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607392eb32d6e---88983688404.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/89719775471.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846c0943d9c---rolenafibenasuvin.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/tusozivibebopo.pdfIn PDF document text
    • https://lavineriablend.it/file/5105041952.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/4809215551.pdfIn PDF document text
    • http://jhroseclassof77.com/clients/45984/File/pufibuxetazinoxiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=important+topics+of+biology+class+12+cbse+2021+chapter+wisePDF link annotation
    • 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_off00010000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 17396 bytes
SHA-256: 4495dff6e1f53884e1f8f269affd28a7ef0674fc485be1cefe4815d6fa170bee
font_01_sfnt_off00012dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBD 11512 bytes
SHA-256: 82b123c74c2714f0197a50eb73fc72837e5516a349492afab924503dbf83df13
font_02_sfnt_off000148c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1