Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac7d93c35613180…

MALICIOUS

PDF

84.1 KB Created: 2021-08-26 00:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d304c762a0ed97418a79ff3dcf7ca83 SHA-1: db01b2c8121768887b7b16523dc2196a7a2fe3b6 SHA-256: aac7d93c356131808ff66cf1b8e4ba31dc802a0a2abbcb0eae91210b178148d2
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 document contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to lure users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=group+work+process+in+social+work+pdf PDF link annotation
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd5edbf1b---86678851054.pdfIn PDF document text
    • https://daismene.it/file/xivazafer.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/c55a6b7d6b1d4ba55dceb266467fe545/viwukaxawasabegibuseke.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/penuvupewonupi.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c24044fd6---65312908148.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/41043899006.pdfIn PDF document text
    • https://bloc-immo.com/images/71264092671.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/navekelajerepokid.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/okp2fchmp6agi9t4aj3370g7pm/lawikuwowufipazufunewi.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/jedogagagovurirazatubuja.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e090f837875be83e9d55dd9df8a04ece/6593553357.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/fodemuzabikaniwavufapi.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/31000589616.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/raxejabixaxogebuja.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/mowuwozadijuzinar.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hau1dl6c7qtstimpdmgm552po5/tekonasaxenoni.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/46503387828.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/74210399962.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/piborezug.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096967bc1009---81315669637.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/a4mmh29olj8pbrongc5rktfmnr/32009952819.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/43061039071.pdfIn PDF document text
    • http://go-forum.cn/upload/files/filepijukokobaf.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ec873351779cbb61ec9fc7b7479e4582/36268877218.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7d2706bb6---keginaga.pdfIn PDF document text
    • 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_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 17396 bytes
SHA-256: 048305d561e995ee2964f9bfdab7d6e4341f9026cf877915508dea003be511a2
font_01_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BD 10832 bytes
SHA-256: 9d99e838343da72a206d7a268da213aa6693e8280b18453bde009b9acd3c8edf

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