Malicious PDF — malware analysis report

Static analysis result for SHA-256 4966a32be61d12f2…

MALICIOUS

PDF

100.1 KB Created: 2021-08-24 00:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7894043244048b818db69c0cfb02514a SHA-1: 030cac9b872a98b99dd27b15c8a4a324ed38d7c9 SHA-256: 4966a32be61d12f2ef9cf9c5d8a2a85a2f0788648d10a0348a8c4bf29cbf2d67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, utilizing compromised CMS uploads and disposable hosting to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e7487957d---62786160138.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a781e9e70---lumabipoxijidedojabinolaz.pdf
    • http://hrudolf.com/userfiles/lusili.pdf
    • https://edusfera.pl/upload/file/98371306004.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/8b1512dff96a715b07e9ea0d22709de4/26210530723.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/86e01e430e2a817ad8794ed8827b00d5/wapedod.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210615_88D8BB8F1D01C7F1.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0559090c42---73209691137.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b7114752b---wizijazunora.pdf
    • http://sushikyototogo.com/uploads/files/31451237201.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f635bc733f784d6d547bc75a5d860ed1/96947764682.pdf
    • http://automsystem.com/UploadFile/file/20210703140402632.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089634e2c807---wizufusebuzizaw.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a91eadb8b9cf3714d3888107dfbfbc9c/72951113959.pdf
    • http://sluchatka-shop.cz/files/upload/files/61722259382.pdf
    • https://inunekocp.jp/mailmagazine/upload/files/totigopi.pdf
    • http://stroisvias.ru/userfiles/file/61189860720.pdf
    • http://vigen12.com/userfiles/file/didefagonikofazuxejanip.pdf
    • http://computer-rudolstadt.de/upload/file/fuxeguwase.pdf
    • http://hoteldanang.com/uploads/images/files/14977290268.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843b7510355---zogazitajinanag.pdf
    • https://ytdrive.com/CKEdit/upload/files/26396524263.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+a+back+handspring+in+one+day
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010af1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 16792 bytes
font_01_sfnt_off00012303.bin
aad87d3c818b12b52865bb09d0322646746fc4631e9a5f3097925bdae3cc47e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 17560 bytes
font_02_sfnt_off00015109.bin
3ebeee7acd205226c4d1d569cd222e9813afb8aae42d006e43cb3e7ef0d8ec2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15109 11172 bytes
font_03_sfnt_off00016abd.bin
281a8e0f5d6ff93c8b68c010f229fb6ad7bb76303726e8bceb98a17be6b52fdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x16ABD 16320 bytes