Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bb9fe925778b32…

MALICIOUS

PDF

71.8 KB Created: 2021-10-01 12:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aeabd96366a2915b7e9cb82b81132763 SHA-1: c935a790ea7e6ae3d44f0b819e6d0e5f28d54329 SHA-256: 93bb9fe925778b32f45c5352c6c8558d421a97bf9730e1e1c4bb38a24fe7b81a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external links indicates an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=thank+u+for+loving+me+quotes PDF link annotation
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/29ccde47dc274623a075dcecd90ed221/44961496013.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/4131771453.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/14864101368.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d2ab8a300d5c57709568495723602e8b/79234676445.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/tejoxadona.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/nilewigovajowevavol.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/9808596015.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///zovivuk.pdfIn PDF document text
    • http://newshop.jp/archive/file/37330343548.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/laxagitax.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3fd302309---xebuduzajedefa.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161522789cef07---94331617339.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb75abd755---bidulemumapikut.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/dufuwidalowuvovaxo.pdfIn PDF document text
    • http://technocom.pl/editor/file/fubakibukamegir.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/99021407723.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/28092563917.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/nuroveruxa.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/35809093388.pdfIn PDF document text
    • http://360global.ca/userfiles/file/43129080795.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/pufetititikefi.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/ragobo.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/zekolufowoxalazoluvija.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/99331029043.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_off0000b3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BA 11028 bytes
SHA-256: 1f7e56889006b5b9a5b6cf217e669cc688cb4cfeb1312876ecd5bc015e74c5c4
font_01_sfnt_off0000ccec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 17300 bytes
SHA-256: fa744ea601786a5133e70c1cde54d9bb1934c6c3b9ae30fe89fcf21af3677d88