Malicious PDF — malware analysis report

Static analysis result for SHA-256 033ddfb94c9d8fe6…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 17:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4caeed81372b94cc058e3bf602e296a SHA-1: bad5909334705a4b5fd16043ad4e8f7d75c8b79f SHA-256: 033ddfb94c9d8fe624b4d8a17a2c09bb95b955b99a55379b40970c1252b6b95c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or are part of link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL distribution align with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://hani-bee.com/userfiles/files/rovivizamozowemuzato.pdf In PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4a1994a8d2bbb6b619638ff227c22146/lekexojupikag.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/26353671943.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/padofubefiweve.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/32545516043.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71423901967.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/98718587923.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/34861296717.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/vetikitex.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/wikadebonalagogusaxanevel.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/4f54c6518adb163949aeeafb5a4d8b59/99053623264.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/jidemilili.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/44280384061.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/27605006595.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/moduzipegelaz.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/58247846489.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160790f94c9f20---24802605535.pdfIn PDF document text
    • https://webmenuplus.com/images/file/47681183430.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfeaee08596---bakewiwoba.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/34614919688.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160db591f158d5---maredibofotogipu.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/81362765780.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a322475ae39---37142569006.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/nunakoni.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/kuxesodobedal.pdfIn PDF document text
    • http://ktcz.eu/files/files/45495694057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=proceso+adiabatico+pdfPDF 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_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 19040 bytes
SHA-256: a5018adf72b475021c1633daa794b2f428d9d395b32f2fa3ea64a91e344bfa57
font_01_sfnt_off00011855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001306c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306C 10604 bytes
SHA-256: 0f82c0cb39166a3347fcc664e47d0ac1214adc6f31ab952551b4add7045f23bc