Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca92af5105bfb1c0…

MALICIOUS

PDF

96.4 KB Created: 2021-07-15 19:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 98b7611dce4f08069256a25f5293e537 SHA-1: 9013943c9d76d4248394ca133d3758d680261a6b SHA-256: ca92af5105bfb1c0f847c97caa2c2e1826a374196720742d3d3e38c6f2bd342c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with numerous unknown reputation URLs, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec33eccf16---dukusififeruv.pdf In PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fadd8df3f---kofelulunozopas.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51481548ee---3657525031.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a97042d0dc0---1046989435.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/19cd12db564863ab7350203f2989f1fe/wotorapanuxanazat.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92fa4b715f---27020679559.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/bunuzabafirod.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608508d90d5f8---rezazuwo.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/zilusuxusenudodaguguba.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/leribelodoxadobaxonoviwat.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/geregajemerolak.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a3de80ebd---tobilutumijuzetoloka.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1abf3dfce---88461066070.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/kefefexawiwuz.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/wivomatirugolipuforum.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080ee2d0e36e---54745731129.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210614_CA47F6D241C70519.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/acc615cd31394c1d3487c6ae872ec700/waporozuzofarovanosimot.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6a8d3aff3---febuwumexatewu.pdfIn PDF document text
    • http://cosyromania.com/media/file/73203294166.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/cffd3ec94e398227c6bf4e2d3760b122/suzalesexofivinelanulap.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dd8851fb8---81533868372.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/lujevulubu.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/kizorumox.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/73489420319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=kinemaster+editor+for+pcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off00011539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 10728 bytes
SHA-256: 4a24251f1a9fb961cda9753a0e594327ed6b5912633c7e8f08140db497884900
font_02_sfnt_off00012dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD5 17544 bytes
SHA-256: 98adee75e66dc9b6e077eff5572b19a15353ab6e25b3383587991cd701216cd3
font_03_sfnt_off00015bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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