Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d789efb4034a748…

MALICIOUS

PDF

100.7 KB Created: 2021-08-06 20:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 660a77824f0cb3f91dfab26ff2482635 SHA-1: 0c5f18c119697ab8c5a817320039faec433ed932 SHA-256: 1d789efb4034a7488c3ab3c0f4d3480a8aeea168bd8818e7e2fda08f63b99e9c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The presence of 'utm_term' parameters in some URLs indicates a potential SEO poisoning or spamming tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://laborke.ru/uplcv?utm_term=zelda+majora%27s+mask+nintendo+64+solution PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d0cf05238---60889710090.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/41c019b3272700ebdc3effe0d78de9f9/dimedimo.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a1ee64cc17c887f212111e006cd86dc3/34489943773.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160985eeca7092---berulunixanoxiwofe.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/72949833799.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/64739687972.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d35256301b---59370945995.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/67250711044.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160987ee86ab15---luxekuxiwufuzimura.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/wevubolubigoje.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/waxopilidiwutazuniruv.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/gozixesodolamos.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/896b704e249de618568347e5384e4aa9/48318687663.pdfIn PDF document text
    • http://huntland.hu/upload/file/4822416936.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/41026360413.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210710_6905B084D3497A0A.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fjbrii9o9d7tjneeggf1ujdb34/detoluzaxak.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/87381655545.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160af9c6c0a427---47626868499.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d2ce27ee9d888f4fe56b872cc79b3329/mobezevezur.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_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 16812 bytes
SHA-256: dc71f952c75db00bf243f4cf570694ee82a645e1131c4c1d30501079472d4448
font_01_sfnt_off000152f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F5 10976 bytes
SHA-256: b32630b956de779d89af32c5cea44438db2ff51d6ca4ce661eba75e4bf3e5991
font_02_sfnt_off00016c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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