Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff07edf99d692c02…

MALICIOUS

PDF

89.2 KB Created: 2021-07-13 17:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6028c0257b2c0e02d7bd60ee61887c55 SHA-1: c5bcc880726f716434f075cffc136ceb3d5ff74f SHA-256: ff07edf99d692c021e6192cbc9636df437b3c1b9112cea2258b130c58dc9bf01
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs point to a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/14676b2a3ec808c57b9e19d0c215b555/romikumo.pdf
    • https://dovolena-jiznicechy.cz/uploads/ratuzuwisogipexituxonim.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jgb88p4548r0abkstag8lo3fat/9128721489.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/840fe96704d6a8453ab7db821af07567/94030067489.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/i4gu3a3kpq69qf7q6074t7vp41/97123244848.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095aeeaa6b16---xisetegirovovidu.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c495f7d0c8a---5296203029.pdf
    • http://efuegypt.org/userfiles/file/16886047934.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/81254449879.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f669c4a01---15647759487.pdf
    • http://zimmerei-possert.at/pubupupulevejevunuwu.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/5c5489crnghjkmgpr9lhgprm37/bimevatudedumobofu.pdf
    • https://ringid.vn/ckfinder/userfiles/files/49669625143.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/m6j1gej4ceareun8aq443c9ggi/zefikirikotireboxetes.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/291977e7433bf6dbe4467675e6285a20/67524952212.pdf
    • https://advance-pack.com/editor_upload/file/61861824915.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4afd8d97e---befuragenixanemefajalig.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a55mo74ikgv9rfhfmc82e41107/rigejufile.pdf
    • https://allegypttours.net/userfiles/files/suzevenaz.pdf
    • http://studioambienteterritorio.it/userfiles/files/rimukuwexulanepafa.pdf
    • https://elesud.it/img_pagine/file/zevoli.pdf
    • http://inspiredindianfoundation.org/uploads/60079888908.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=nfs+most+wanted+2015
    • 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_off0000f6c6.bin
5e7c1375b21494bbba1991b0d92f14a2cb5a66eb77ca06dc720f5bca9ab6fd46
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 10768 bytes
font_01_sfnt_off00010fc8.bin
e77772aa0d0ea987670f8419ade497f18e2d1f3c075637fd04678d4fede0fcf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 18944 bytes
font_02_sfnt_off00013e73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E73 16792 bytes