Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ad45dfbd606c34…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 16:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 230c352f7df1e1f291959da5464dfecf SHA-1: 4384c7e50fb4cd3ac3cd78073d40763259a37fcf SHA-256: a6ad45dfbd606c34a3a3b1f4cd68bf740fab34d9f3a534379355e6eaba46e1b0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://huntic.ru/uplcv?utm_term=lm+logo+maker+pro+apk PDF link annotation
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a488656dc7---85316396846.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/metedirim.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/28952348240.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613705cc4ca6f---55491056834.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/994qp3sl0ghqm2nicrp46mljg3/16288570062.pdfIn PDF document text
    • https://emprenderem.cl/files/bojosiduzutavatebitow.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/58699892556.pdfIn PDF document text
    • https://samowar.me/upload/file/75308986475.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/nejov.pdfIn PDF document text
    • http://sushi-belovo.ru/files/85644348591.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/ronamemabodapefalipanunip.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/vavudewepasaz.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/5016729393.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e54044cbede69a4ffd55ca1d92d8c3b3/66552048163.pdfIn PDF document text
    • http://hrudolf.com/userfiles/96193712672.pdfIn macro / runtime command snippet
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/bb96912fcf95d9ed673b415f258ebbbd/bapekogepe.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/jdfv7fg715dg5ggv25isjjbl87/17062740535.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/v3qua3dj8d9d0llc6r9v1jf1ob/kesoxo.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/81914751984.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/bajip.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/13067509106.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/55313258720.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/65645458847.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/kimudelatezen.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/70740444528.pdfIn PDF document text
    • http://birons.net/wp-conIn macro / runtime command snippet
    • 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_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 17768 bytes
SHA-256: 563a48dc6947b7aea27937d2aa5591fe8c06797a3a3bfd816429cdfbd6843b12
font_01_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12042 10184 bytes
SHA-256: c184484347b014c739a4aaab2f1e088247d1e510ade72d8d5a7ea6b386662354

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