Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4a1c2a25115098…

MALICIOUS

PDF

83.9 KB Created: 2021-08-20 13:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a0daef3bb4513cc4de49fffcc93ee1d SHA-1: 2ff3618005e0e11438c8c373c7f68be31fe21872 SHA-256: 2d4a1c2a251150980474645ebb323c19cfa784106e4b6dbf53a7d320c3d85837
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=toomics+conta+vip+gratis PDF link annotation
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b289a8cc1---46129435660.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7363694d0a---banaviruzezipawenozata.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/41636932916.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/a97320f4f3021eb3abac02c363e08b5e/riwakapitikubatu.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/pibomalegobolegapuru.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f79471b4715---23812223517.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/18609434067.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210529202031.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7b3642d5793b6b630bebe01133644419/17419706482.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2dc181faa---33554460280.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/fetojemav.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/9d6a593cf79fb467dd862d743cadc68a/27671294727.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/79236344674.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc717a63b---2952544727.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f54fa7b8fd8d968347445a16954f28d5/57983095391.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5c4619bb9---20965270949.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/wozozigixogokovubijifon.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/unn6p37e02shn7ddtioiln5koh/bowomezovabilipopimi.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/cca42299e81c2bbeae4616511b6822fe/mategenavare.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/gavutur.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/35881006353.pdfIn PDF document text
    • http://ecologie-energie.com/userfiles/file/powonevugabarebutir.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b34fc44b85---vuzisefivimorinok.pdfIn PDF document text
    • http://usagimatur.com/files/others/dilelededod.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/77889050276.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_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 10568 bytes
SHA-256: f6d4d8ac19b9646436b533a2fac4d3703c44ff3a0b57ba783f7568c5ddacc772
font_01_sfnt_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 18112 bytes
SHA-256: 37dcfa9c2e423d12327fee51f18e725a27de1c8c13b35414b113a9ef1f1032a3

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