Malicious PDF — malware analysis report

Static analysis result for SHA-256 43524cf227eda6d4…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 09:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fbcbd7667fe7aaef68d0e9344678f1ed SHA-1: 204f7c4a65b63431876ab990a2d2cc369494c018 SHA-256: 43524cf227eda6d4ba901861465ed311626e7906d52397365f3e3cfc6fcb4508
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links. The ClamAV detection and ML classifier further indicate malicious intent, specifically classifying it as a phishing trojan. The embedded URLs, while some are marked benign, contribute to the overall pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://diarch.in/WYSIWYGImage/file/xoropoxamip.pdf In PDF document text
    • https://radekslodkiewicz.pl/files/file/10035742221.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/89354a8cbac5e758c10159b11871b3c6/pabedazilemitixupeva.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/nodidesabonoliz.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/58205782394.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/rolilatapagarivuf.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/mixosodefejobotonu.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/judifegaxuvivofataxiva.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/dfc4d15cfe23a60fc568e19657f2ced7/30276071164.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f59d4d2dcf---dimemifinosu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160827b1c0a2fd---fobef.pdfIn PDF document text
    • http://kes.org/upload/editor/files/kozevatawikapuresubiv.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/livurax.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/25930325399.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/sejoxuzev.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/tuvofitokezifovaju.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160886d5a2a976---87743892928.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/806e5b5182e5d3d29742f90d03e97d53/57879000028.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/limawamipavipoxi.pdfIn PDF document text
    • http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/85505194722.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/15904562609.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/88785317545.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/5f0c944912c3ac4a2fe44973a69d596c/megabasomoxekabakila.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/43703797858.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/65469751261.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092184b137dd---3703928508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+happens+when+you+stall+a+manual+transmissionPDF 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_off0000dd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 10812 bytes
SHA-256: e243c1920e10fd7bb00de5c1ff2a4b0c8d30a6cb93e9c494f62644eefe89c026
font_02_sfnt_off00010e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2F 16672 bytes
SHA-256: fab0e5ce94cdc716e69fc90df0a8781dd5fa140541eae62b90a43ec56a611403