Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a327d579a1937a4…

MALICIOUS

PDF

73.6 KB Created: 2021-09-14 15:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97a8aac586b68a92b70520df81bf7379 SHA-1: 9f180ab07bb851cd97eceb146e1d160a50850f5c SHA-256: 8a327d579a1937a49bb22d76dad4e546a1bc525223898edd0858c32f34111e4b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to compromised WordPress upload storage, suggesting an attempt to deliver a malicious payload. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zahrek.com/userfiles/file/wiveriforu.pdf In PDF document text
    • http://blankheich.de/images/uploads/file/59948306626.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/32412373320.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/66489952806.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/2512386257.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406c5da8091---firerireseral.pdfIn PDF document text
    • http://congluc.com/upload/files/nafotexi.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/98621551544.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/folipoxomuxegesifad.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109091402131827.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/4321702091.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bowowufedajikelamive.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/gusifipotenukujakujegega.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woxogimetupapon.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/46386923059.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/danizilojag.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/59090076592.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/xivogowowipowukevese.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16131bc8a9cea3---78808278908.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/nexakijezuvubexiwu.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/31300777000.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/36172709396.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/60997091147.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/3043169800.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/57885256790.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8a7d1df997b87ceb06a174ea4d80436f/21198267556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pdf+to+paint+converterPDF link annotation
    • 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_off0000bf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 10464 bytes
SHA-256: d259c07cfac181702614a5dd16676ffc2fff30dc7eb00920843943aa52725b50
font_02_sfnt_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 16252 bytes
SHA-256: 71c94087ecaa1f0345813f9c9ef49ebb1d29da1e938c8bde04e6375116863229

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