Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b04777b6699fbd…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 23:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f1bc982f46a4be53d3d731cca503f789 SHA-1: 90f3353bc0178b537e479816d3d26f209990efeb SHA-256: 13b04777b6699fbd1924bff17f7f48e1b9e66f42eab472397b199b3ee28d14d8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://premium-house.uz/images/file/majamekutonujiderudoxam.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8a9d2d7a651c1e6f63717a355696a78c/96376509564.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/48990731031.pdfIn PDF document text
    • http://uhli-janmaria.cz/userfiles/file/15640185558.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98683fe0d---8600813329.pdfIn PDF document text
    • https://bio86.net/fichiers/sapatixaves.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077be7c75ae6---28424817549.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c92237a658b---vuzufuximoxakakutigawaz.pdfIn PDF document text
    • https://www.roadsafetyrental.com.au/application/third_party/ckfinder/userfiles/files/xikujifikotowidutul.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/32663636149.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/15170353713.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/36224243537.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/edc1653a846278cf88297e04fa4799cf/94822005704.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/gizepejavu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7d59d6cdd6ae90738f1ab5a022650e20/dogeduxewubibufafagifif.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c1911ba014---jomasuxada.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/dobozajiko.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/34147773852.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/dojalumopipedawa.pdfIn PDF document text
    • http://flexicourse.cz/res/file/vumawokitiko.pdfIn PDF document text
    • https://isosklo.cz/uploads/25494478996.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8bbb8a99c---84729341379.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/76977198470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=adobe+photoshop+tutorial+every+tool+explained+in+tamil+pdfPDF 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_off0000cd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 11268 bytes
SHA-256: 57aaeefd25147903b8109abd9c161879e682e31bad4070bfb4bfa980f7f8059a
font_02_sfnt_off0000ff96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 17248 bytes
SHA-256: 297b617fc4b93884c34bd2de78333adfb138a331acbb663bffe9a6b323d2aa1d

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