Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9f5958ee3e90c7…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 08:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 330af228af5b99ece54bd98d6bc4d79b SHA-1: 3fcda9a83a7b4464e185d31e3e49737e42abc877 SHA-256: 9f9f5958ee3e90c71b1219be1746a6f5980aa7408a19fcd9141bfd37a825c287
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of compromised CMS upload links suggests an attempt to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://kalmi.ru/upfiles/files/tamifaledefuduzof.pdf In PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/29146779298.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/72897616275.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/10783047893.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/22640665743.pdfIn PDF document text
    • http://dakov.hu/_user/file/38212442789.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/58918302273.pdfIn PDF document text
    • https://il-gusto.com/images/file/dunapezoxebidaxorax.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/89443398996.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/lumuj.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210904_8FD9383F3F5A8AA3.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210911134546_hdgjws.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/31752084557.pdfIn PDF document text
    • https://mackbeks.com/files/file/temitisegixigijofipofob.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/labumawoputi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b59d7b5a3a---golibopetewevaledepijis.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161404224742da---pasubakowiz.pdfIn PDF document text
    • http://calisnt.com/uploads/files/71965488430.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/dukixijewobutegasigu.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/77535959670.pdfIn PDF document text
    • https://kultmotor.hu/images/files/nodesupobu.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d6582c577bca37dde275e047df59b805/xilezapowaxeso.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/78839956822.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/mofajupefiketur.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/nomomijujavorom.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/sowijilekedokil.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/jelitadug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=smartphone+link+garmin+apkPDF 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_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 18744 bytes
SHA-256: 1a24514fd0adb7efcb0ebe67d40f72dd05ca88f2a537e023374a9514208f6e49
font_01_sfnt_off00010d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 10700 bytes
SHA-256: 6d99f7636facc767b0725712591e1c29106b019fd627da6cc7f7374543a10780
font_02_sfnt_off000125f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1