Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec36b4297c3abf1…

MALICIOUS

PDF

78.2 KB Created: 2021-09-01 19:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5bf74b343eb18ce7f2c87e39ef23e0c SHA-1: 1c6356145fb6f4f20c632b5157a25d648262a3b6 SHA-256: dec36b4297c3abf199687535bcdd1cd3570a04245ca6515cbb3bc1e05164bf28
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing lure or malware distribution vector. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://autohondl.cz/userfiles/file/27713280466.pdf In PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210820_E13D5BB842FE662E.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/34ufneh1qrlki4dog7b9htc9s1/31425604697.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/42101ea84b04fa8f2411ea0b4715b898/49249201655.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8ff50cea3ab44cc1d8308dc1baddc1fe/8736163109.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/b3creldo32o3lk7m0hck9ktdfe/52878372473.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/jetoren.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/42282734508.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0930a58b044c4590e389f367257313d8/34380534911.pdfIn PDF document text
    • https://ekransamara.ru/files/66755900975.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d4bc2e4a8---lenuxizijozezuzuka.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/foxamomuzamubexaloj.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3d047130---gadopasiwolane.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/408beca70fbd0d53f712ea22ef4ca6f6/26749217171.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/42039439106.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/texijebagovujodawigid.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/76494352046.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/mivedi.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/damax.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33b0c53255---mobonaxefudosovabozure.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/lovudomogivefolojamimufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=computer+applications+for+business+pdfPDF 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_off0000cfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC1 16084 bytes
SHA-256: 33410a03518c708c0456afcd1a08d8e1409007a3246cc0f32fc86d75206df2cc
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 11052 bytes
SHA-256: b8683eebe739249841cf801538c4ec56854efdfbf29f3034fe8d3ddb5b7749c1

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