Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1b299dbe20d0ae…

MALICIOUS

PDF

84.2 KB Created: 2021-07-19 05:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bba1aac024d951848feded610bd65f44 SHA-1: 80029f3991506bfaf13439b746b2affd5fd15630 SHA-256: bd1b299dbe20d0aee2ed84630cbcc2a2c0462db907641753881c800b0cee5068
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://rotterdampools.com/contents//files/17356255714.pdf In PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd8925aef1---42470557097.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/a7o5e195hu06uufecdfo2mk39i/20697383395.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/nezisevod.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/dusitozaxalamuvov.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/7235960561.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/6cf7edaa414f908aff875aef2c103e1a/viwulinotorixuzuduxekazi.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/6466815070.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/nivavudefaviril.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c69ebae6820---85293467290.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/45341604933.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/et3kt88uma05tl3os85a7kh8hq/jixasebuguvuvibawejoboxi.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/34496009131.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/96231010844.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210621_75BCE15B41A00C4B.pdfIn PDF document text
    • http://jucal.es/images/file/40775487503.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160f01b406fb4b---92375917075.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/kinelukanexopuwilobi.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2107132029047248435hh0ylwfcn8r.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93c2d245f---worumurafewetisu.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b29ad14540---90669122492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=conduction+aphasia+definitionPDF 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_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE37 10704 bytes
SHA-256: b2b5a8b7b74a8cc0f6f27902767c1dce562572e644d963f8273127889a575310
font_02_sfnt_off000116c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C1 17664 bytes
SHA-256: 9c134db0b0886e420939fb9752054c8e98257f1102a8dea1947173114b164f8a

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