Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4c1a23d5368fb9…

MALICIOUS

PDF

69.9 KB Created: 2021-09-22 09:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1559ccfd08ca112b53a9d33adb168e08 SHA-1: ccdbbfb0717d7befe5c9af6562129e7374ad3150 SHA-256: 2f4c1a23d5368fb98a49daf123477a3d8cad781b0e88ba1fb040271bef37f183
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://santechnikosdarbai.lt/images/files/laragipowokezuzogabapoji.pdf In PDF document text
    • http://arenabilardo.com/data/_files/mesekunulawamunefugusal.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210907_27A334935BAAD019.pdfIn PDF document text
    • http://fourfoods.com/images/files/lufelagiremomin.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/15141388875.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/xefizixiposujesadon.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/60374103131.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/9554045887.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/26019882222.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/febaxumi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161383d453d618---76680197139.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/borewivagerojijuterivuneg.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16143475897ba8---fekivupadirurinenusareko.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/lakavid.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/94367636611.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/04886c10b3f662100c4420589c9edec7/34222542175.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/94129142047.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/86956783083.pdfIn PDF document text
    • http://rilta.net/userfiles/files/13575022777.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/52443201018.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/79bd4bdba4f5cc60febca86255a64438/84531303538.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/dotozupuzime.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/jifukeramapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dua+for+mum+and+dadPDF 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_off0000b4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEA 10080 bytes
SHA-256: 4e5728e72401489738fe7b86d6c1c1c8144f23dab24317f2f4840c702f842f19
font_02_sfnt_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 15548 bytes
SHA-256: 59c7f06b02314d86d62e6da2bde066970789b1a75ab2824663107d447d90ac2d

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