Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49663409b626ed8…

MALICIOUS

PDF

85.9 KB Created: 2021-08-04 23:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 79ff426abba174b5991fd60be5ea082c SHA-1: ac423dc400e901d1e9e4900f0b632bc57dc2405a SHA-256: b49663409b626ed8b15dc641346a497d9d7960ac9d7bc4d8e4cbded7eb18fc00
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content.

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://medvor.ru/uplcv?utm_term=what+to+study+for+ca+license+test PDF link annotation
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/resugotonutesaxijug.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/99655660741.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210506040615.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/pelokifelusumewigata.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09a6d51b56---lovinivogogalumovamuvizoz.pdfIn PDF document text
    • http://polletnv.be/uploads/files/valawutejoxakesorodegeva.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/namezimukozat.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ef5f9a65f---runodotaputuxufe.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/ruxudeguzivovibasukudig.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cacde0ab6f2---82636754931.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1db562d504---zidusaxogabo.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/ndsvjosv27698vnh7440orgr7c/wokigiluzapivokel.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/pebadubabelagofojur.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d04e715381c4df5bd13aef29e0f24978/75536482593.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/40418980295.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210804135503.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a301f9d749c72ab88b9ac8c71b422107/97557691074.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/bewikimusida.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f49b03e4a---wewodokikebuwenokirido.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210718152656_jfovm7.pdfIn PDF document text
    • http://vtaky.sk/media/file/defepabilaruseved.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/wojad.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089d36a72fb9---ravirir.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/tasijilaxiru.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/nurupup.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/ruwuled.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_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 10780 bytes
SHA-256: 2861f2ca5fb35301e5d5665db0f42fe65129c96b9fc9b90b12853eee4e161386
font_01_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 17488 bytes
SHA-256: 17c64b2dcf0a26571247a35b744aadca8cb4d15816bb91e563bcacc5b55c345f
font_02_sfnt_off00013186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1