Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6abcd64dc5a3def…

MALICIOUS

PDF

124.0 KB Created: 2021-09-21 00:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 694535ce887eb304341a1fbeccf08a51 SHA-1: 46219158358c2d3c81d22b92cd5c05432e1b62d8 SHA-256: d6abcd64dc5a3def5ce027aa80cf422b164d0349e9d20cb2f3ac4515ff562fe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/uplcv?utm_term=macbeth+as+shakespearean+tragedy PDF link annotation
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336a0ac5e24---98669062342.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/sepazubovawileperesisumep.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/nizamodujiwubowaxafeba.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161457367e98ac---97719096763.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16140959691abc---fisugiwolalegiv.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/78475601869.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/83722873605.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/85683089032.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/13608906384.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/zodilenixosuloxuwak.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161458d219f798---52805516541.pdfIn PDF document text
    • https://noventa.cz/media/files/file/wimegalasikuzamo.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/dumina.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/xorijen.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/34958901871.pdfIn PDF document text
    • http://bastola.org/userfiles/file/vadoxowixalimagidit.pdfIn PDF document text
    • http://destock-groupe.com/userfiles/file/35909943672.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/zepixekoka.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/zikofatagilebozunojufel.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/zewunin.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/xotewozejagisukojipasere.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/11170201815.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_off00017f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F51 19300 bytes
SHA-256: e576a900da8974496003bb935a2994199e469fa040944ecd153356e8e7fdfcca
font_01_sfnt_off0001b123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B123 10872 bytes
SHA-256: 6fde1cabaa7c166e09b10b8765139584916ef8b48f8d91eaf8191968ea1200a8
font_02_sfnt_off0001c9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1