Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37428458d692e40…

MALICIOUS

PDF

103.7 KB Created: 2021-09-08 08:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 43c2bf123e907cfa0be98e59edae6afb SHA-1: 66f0120c2a1d5112e3ac1f326b713006e466a872 SHA-256: c37428458d692e40dd6844d5ab5fdd44d5462b681c116945a8d0ab12fa17c85c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and the PDF link farm heuristic indicate a strong intent to redirect users to external, potentially malicious sites. The use of wkhtmltopdf suggests it may have been generated programmatically to host a collection of links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://infrive.ru/uplcv?utm_term=detroit+lions+schedule+2018+pdf PDF link annotation
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/xibed.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/lepetofefolowan.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/28348582791.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/tivaruz.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/nodetaz.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b46fc2dec---1036347999.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f423f4b40ef---dojagasusidavilimasilil.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60e05804e---85581398228.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/1207427478.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b08f1a4ac7---wemojezafisepififetu.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607937feb215a---72381026739.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/bf9809e9855ecc632cad6e65f5a943b9/17243612617.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/576b17dde1941c0de732e348bb521a53/22675809026.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/52903533914.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cfdda92ae---92156543386.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/dimejamigifoga.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/dexobukonijunusanetop.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/katelozupisomubapag.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/33341662374.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb42124ccf---lawaxitirimavoguxata.pdfIn PDF document text
    • http://asfalon.com/__files/file/bujejit.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/zolamiwuxe.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/zusamewafigasidi.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_off00012dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC3 18652 bytes
SHA-256: cda485812b2b55e2cef6ce97715db1f34e46645cad95398e6310a5cc8062ecde
font_01_sfnt_off00015ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000176c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176C4 11156 bytes
SHA-256: f1f673da57404c382ee25011e94bf5b8e5dfe00cda140abedd6611425f0f4b2c

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