Malicious PDF — malware analysis report

Static analysis result for SHA-256 280e61d3c6fa3ace…

MALICIOUS

PDF

73.8 KB Created: 2021-06-27 16:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a28e46df81746cf2ca843ff21baec3d3 SHA-1: 46b43387a7314ba79086a92f2da77c9d30199f88 SHA-256: 280e61d3c6fa3ace86e85a779109c8ce8f3aa778b0b5dbdff0effea69b4f79ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of external links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nhakhoaanphuoc.vn/uploads/files/20904007030.pdf
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/0c41fa7162ad8c572e9221dd25fd5d9d/pozidofuwadosa.pdf
    • http://mea-travel.pl/userfiles/file/noxedatolekenolak.pdf
    • http://hookmyweddingup.net/clients/73542/File/tilekexozi.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077b72e5199b---pilexolo.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2ed415f66---3465905956.pdf
    • http://sbnjl.com/userfiles/files/11889954418.pdf
    • https://stallion-international.com/userfiles/file/59716292822.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a50ede93739---39383039423.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948f56dd4a1---46363889031.pdf
    • http://0-50.ru/userfiles/file/67145164399.pdf
    • http://heninrealty.com/userfiles/files/rovunosowabafuju.pdf
    • http://skolicka.eu/foto/images/file/73134001124.pdf
    • https://airshow-bg.com/file/wurapizerajavejevebo.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae07269e70f---11244298763.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071d80666d6c---sutisizelazosaroka.pdf
    • https://echipamente-scule.ro/userfiles/file/famodelepinarafaniririp.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/b1bd992ceed680ebf7525c05b5aaca68/4316258259.pdf
    • https://kodcomputers.ro/2664/uploads/6248897144.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087f25058fe1---wowesexos.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fc9df3a0e---13450750243.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gerund+and+infinitive+test+with+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdaf.bin
20cd180047d65e1210f28f52d4021a9c9bb3456bb44eeeaf6cb14d2d423c922b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAF 16872 bytes
font_01_sfnt_off0000e9ba.bin
1e71f81a79b3ea5ebcaa20a28d120078892310b1020882c3a28066bdcf57071d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 10576 bytes
font_02_sfnt_off000101e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 16792 bytes