Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8701268591ba56d…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 19:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8496631e28ba031616414bd4f4f27674 SHA-1: a83ef42464592adbabcd83ae596674a8caa9a8d5 SHA-256: e8701268591ba56d5bf23bf1726fb0ccc671b737f45c4c24bfda69a3a58114bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://indago-rovigo.it/userfiles/files/raxonore.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8m1l6ktn2f46buq5k82an7v8nk/73431488733.pdf
    • http://studioingtassinari.eu/userfiles/files/64108468325.pdf
    • https://daynexweb.com/upload/ckfinder/files/duleperuvug.pdf
    • https://reklama71.ru/upload_picture/viwetevesajezagogewali.pdf
    • https://dobre-akce.cz/media/files/file/wodituxan.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ab66160192117dcd9920149497276f8c/vaxozituravepim.pdf
    • http://kursadowicz.pl/Upload/file/detuletop.pdf
    • http://sgyscom.com/upload_fck/file/2021-10-1/20211001021702487631.pdf
    • https://www.igescanada.com/ckfinder/userfiles/files/moram.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b421034f3cf99a9b0b10af804c9d48f9/11636160004.pdf
    • https://alirezamirmohammadi.com/images/upload/files/taririka.pdf
    • http://3dprofi.net/images/uploads/file/85008183156.pdf
    • https://vildmarksjagt.dk/userfiles/file/sokirifowo.pdf
    • http://manpukuorder.com/uploads/files/tefuf.pdf
    • http://ain.proximeo.com/ckfinder/userfiles/files/fonomimi.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/vatituji.pdf
    • http://carrasvilla.es/uploads/files/16034580525.pdf
    • http://files.ibiza-ferien.de/file/24686626223.pdf
    • https://mb-classic-service.de/userfiles/file/93950662024.pdf
    • http://benhvienlaptop.biz/userfiles/file/norurozakojelonolazarifox.pdf
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/59562257572.pdf
    • http://dierenwinkelindex.nl/images/uploads/ganazatajuxudonubo.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb59a60a9---kegul.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614d037e6cc03---zadolukoxofaj.pdf
    • http://capitolmetrophysicaltherapy.com/files/files/watanezoju.pdf
    • http://gdlejia.com/uploadfile/files/20210908_221330.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=many+congratulations+on+your+new+bundle+of+joy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b354.bin
14b98c4e2c64ab0713befff33492b3cb678ad71f187f3e2e8af5e59ea7e6de33
pdf-font-stream PDF embedded font (sfnt) at offset 0xB354 15472 bytes
font_01_sfnt_off0000d9f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 16792 bytes
font_02_sfnt_off0000f20e.bin
8d852c51c181308d141be27b99e3575297848ddae57673389dea11ca86cc65c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 11212 bytes