Malicious PDF — malware analysis report

Static analysis result for SHA-256 2583d902a1ac326e…

MALICIOUS

PDF

72.5 KB Created: 2021-09-06 05:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3fe8afb90da7a5c2612926cd2a3c89c3 SHA-1: 48e1f9152bf41bf1217075d4321d47678bdc2504 SHA-256: 2583d902a1ac326e34e370dc7f2643ef76f079e87976cabf694ba69960f02e6f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The embedded URLs point to compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL findings strongly indicate malicious intent.

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://inwebjor.ru/uplcv?utm_term=2014+toyota+avalon+xle+manual PDF link annotation
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b7cf14a28e6542f5efcf893560e962fb/9043364711.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/60831597267.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/govejizezavodu.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/pekow.pdfIn PDF document text
    • https://plasy.com/uploads/file/63032618057.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/gijebulejumaruwewagotasuj.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210829202301.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43ade29eef---4993831215.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd50392bf9---27379771427.pdfIn PDF document text
    • http://djapm.com/userfiles/file/26009093219.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/63554315526.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/73734197559.pdfIn PDF document text
    • https://aedwea.com/upload/foto/64120410612.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/52961722410.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf65f3875---rodux.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/70115323620.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/6687985691.pdfIn PDF document text
    • https://soechi.net/userfiles/file/17617747664.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/kumemimogogilanonij.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfade8ab8e8---29102155787.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/89123323129.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/2529577137.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_off0000b583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB583 10564 bytes
SHA-256: a7ac66d54039d28873f184d464a32944a0499f41b3ff0751ddce33dec83c7339
font_01_sfnt_off0000cdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 18648 bytes
SHA-256: 8ff323eed51c6e4496ba0ec760ae238ee42d32599be392614d8f558a780841a4