Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6d8a126b01a68f…

MALICIOUS

PDF

84.2 KB Created: 2021-08-23 12:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0caecc956a47751f6cd59ee8497c7a8 SHA-1: b3a182bd85287bbcd1b809bbbf651bc8eea42307 SHA-256: 1d6d8a126b01a68f5ff8ced2734a4a59c06d41f1a9bd1346bc784c417d210c3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://sosonomo.com/ckfinder/userfiles/files/59850685064.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b3edb2065---58457417325.pdf
    • http://austria-ex.com/images/blog//file/32449928007.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/80716394818.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/51728862637.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f430a05fe7f---gobesivaxe.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/8980b9b43f0ddc8b9fc0ea98fca508fa/64104088532.pdf
    • https://hsse.cl/files/tekebi.pdf
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/63070086280.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0ff8a6ef---61809771611.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/v96nr14k4ef34bljspve9q37r4/63321286897.pdf
    • http://musiclivemarsala.com/userfiles/files/zagupuwememuti.pdf
    • http://akcjonariusz.com/UserFiles/file/11923672801.pdf
    • http://kotolantopeni.cz/file/sidibawibiwe.pdf
    • http://zimaletto.com/uploads/file/69636681251.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0f9d05ab5---24024382363.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/96aa21e97b75a6c79e637b02c6e55def/85053796792.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084b56d1f489---22587992710.pdf
    • http://otczenacts.com/media/files/zenutolanif.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/298213b22c72a50253db2670c2b69e6f/fivimiremedibibiful.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/ruzajoduvirifavimamowip.pdf
    • http://nousgarage.com/userfiles/file/56582597485.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc05236053c---fidimimezolixakir.pdf
    • http://xdata.pl/app/webroot/img/ckf/files/65752610234.pdf
    • https://accuratesearch.com/userfiles/file/xowog.pdf
    • http://ke-sen.com/userfiles/file/1628958580.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=event+planner+business+plan+pdf
    • 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_off0000e700.bin
8c0cbac8b1d3ba0517e461b7273922ff7f7511e205b9c2d4dc0ae9a02fea66e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 10660 bytes
font_01_sfnt_off0000ff4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 16792 bytes
font_02_sfnt_off0001175f.bin
610fef755ba088d50e38612c6ba308fe9a381f00efcb3bb9612313dd1f424138
pdf-font-stream PDF embedded font (sfnt) at offset 0x1175F 16408 bytes