Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b6349abeecbd52…

MALICIOUS

PDF

80.4 KB Created: 2021-07-14 10:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8c8ebbe538bdb7784a3a16189f898926 SHA-1: ec67bb35930094ece7e35523b0538cf451636b7c SHA-256: 98b6349abeecbd52d02de8a2d7d693e0b92a8a83411e93b61f8c0f421e6e6bf6
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://tavio.ru/files/file/76215738456.pdf In PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/29660004470.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/67550456297.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc53080be---widoluviwal.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/ff613fe776d71c8a6e7c64623ed0664b/65026228407.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b42e7d98b---karawodisifigirev.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/okbilds7ckf11moj4c45q245dh/rakifuzoxevulolozetukid.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/bee5460b9a0f5237d0bdf7fa5b71fa65/nasen.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/sexovafinipelijiti.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/46596949910.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/navagib.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/rapozidetevugavale.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/22223477484.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/65422034037.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021051910113173499.pdfIn PDF document text
    • https://puppometalli.eu/file/gufog.pdfIn PDF document text
    • https://marosme.ro/hirek/file/velokulojajowatedopupud.pdfIn PDF document text
    • http://humanlitech.com/files/files/32046648846.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/u3pi4nroun5li62vi19n0rmpc1/88791108436.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/263f349c052314f359b3844fa09e56e4/tunonixa.pdfIn PDF document text
    • http://chinahongji.com/d/files/vozarenikolutipagejo.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/i8gmb4cra3n4ltpelb27nvpvpa/vomamenobuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=frost+on+compressorPDF 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_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 10212 bytes
SHA-256: 9ee9c5b715ffed8fdb075d695197896bd997d8c17936c69d1158c22d72bbb380
font_01_sfnt_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 16904 bytes
SHA-256: 8f4a6771f0388ab197ace0a3e3678a51a9c8e10b8fcc0b06b63555a8fd12f2c8

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