Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0db4da3a8dd9da4…

MALICIOUS

PDF

100.1 KB Created: 2021-08-08 08:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d45edfc174e580f3809fc2872502d59c SHA-1: f68b0dacae5cbb32d98270fe81fc5d4ba5dbb261 SHA-256: c0db4da3a8dd9da42ff4578b5ed1b3a41b503dd671abe335df4490da369069f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous PDF links on disposable hosting further supports its role in distributing malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://bulendengin.com/upload/ckfinder/files/zulofufubekonogexoj.pdf
    • http://giprozdraw.ru/ckfinder/userfiles/files/81855474.pdf
    • http://cathugo.de/res/wysiwyg/file/71559372536.pdf
    • http://sanders-scottfamily.com/clients/26926/File/87611057533.pdf
    • http://hongdanhaudio.com/luutru/files/xuxamixusulagejokebede.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/95b5188c7b834c21c8eb9b7cf4050da8/resosevegebotodosedivu.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/5bf20ed10c3707a54c62f468f5b75247/fazam.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/93ca178a601292d1209f92734c11712f/79113307685.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/050bcdca039d610bf1692218baecc3e5/tosor.pdf
    • http://trendymamy.pl/userfiles/file/wetidiruvilipede.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e6d4db08b---18047014758.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/b8b8tmctjcr4ru3hk7m888uer5/pigevuluribajopar.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/43142c5926df1b72b267e4a32fb18a14/8756512280.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/dikoji.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070931840015---reribe.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce3d6e0dda---29496992336.pdf
    • http://hvpeds.com/upload/contents/file/60082100911.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/76d82425ebc95055022914edda1487b2/56598878489.pdf
    • http://dezmaster.com/userfiles/file/45046540233.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/b04db253689de81db73d96bebf2ef47e/22573708942.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0754de383c---3442352934.pdf
    • http://maysoi.com/hinhanh_fckeditor/file/51020173873.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/1c2iv8n8mabvp5fivsebqc5138/pexejudovijev.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+install+amazon+echo+dot+2nd+generation
    • 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_off00012145.bin
791980dadb4f6133e7a899a0a2ef80fd18751ef50bb51ecf4e5fdea04a88ff83
pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 17960 bytes
font_01_sfnt_off00015074.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15074 16792 bytes
font_02_sfnt_off0001688b.bin
365e14edf7f389cd735e423469b001a7d4ce7a150ed4b9e75e61d2fff04f6ca1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1688B 11076 bytes