Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bf3730f9368e46…

MALICIOUS

PDF

93.0 KB Created: 2021-08-07 23:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86b80e74a4206b31854fdd1d840953ea SHA-1: f94d310ae283584dbc665134df0665458ae8c974 SHA-256: 15bf3730f9368e463386d81792ba4e194531a7e504703d29eb62392599b9987e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://traffictkt.com/viking1/uploads/files/15851999697.pdf In PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/ruvadodoparuref.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/titagenisorir.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/63175186937.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a2d2cbe9313191db91fd6eaa5b121934/nipumademudalino.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9qbdh6e29m1brfsr40ojg13bi/fawubaziwoma.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/jinaferubewitumenoveropiz.pdfIn PDF document text
    • https://eventaipei.com/upload/files/jawenimufevaworinokewi.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/15990384487.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/13121758259.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/59577336109.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095aeeaa6b16---xisetegirovovidu.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021791246593730.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9ac1ea7b87664829bd453b815822c074/sadatolugejelilevitip.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/fkkac7sj78k76g5t677ka845k3/27714179713.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/86845834769.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1610a7133601b7---16102511814.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/gevajeles.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/31891712343.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8de4976f34---81079341839.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4c7q7tif4ft0p8ilhosgvag306/16261912796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+can+i+get+free+money+for+bloxburg+2020PDF 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_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 11288 bytes
SHA-256: f955ea895ee2560ddcdbab95ad41c086ef1c42e02a24ed4595e060202bce6351
font_01_sfnt_off00011ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF5 17192 bytes
SHA-256: 911e1b5799c2027de639088ef2b68b0e774e2d50855907a9d319cf762b69ea6b
font_02_sfnt_off00014cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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