Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c4eaab376b410c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 05:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b0143470e9c3fd73827f535a246a54c SHA-1: ae87eeabe0ffa23679d3487d2c070a683813b98c SHA-256: 86c4eaab376b410cf524809855ee82466708cd5a9867f646e211f8d3d567f1f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, including one pointing to a compromised WordPress upload directory. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dbmotorbrokers.com/userfiles/file/72016490986.pdf In PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__611C5D16599BB.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/13815667796.pdfIn PDF document text
    • http://premo.at/userfiles/file/49201307680.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ade5df0a8d2---64925625071.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/remifesageguwaj.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/gimumamujab.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/3gvvoggh71lb8rs3hptbbguhkp/wasofire.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/78552430535.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/6e7cfa970b17c26d5b2a93006138ef46/54040614716.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/28193546740.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/subokulisatodarem.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///zejatugurunim.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/gerurirutosexiteja.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/nuforejexevogibu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755be4ba65d---22573809841.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/44524533460.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082315fe37fe---mavew.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/8rvqgbk71df0skitp0sg68uevf/96808351938.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/40851924890.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/losuwikomilewapos.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/warajawobunijigezelejavo.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/sugobakuve.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/31727290050.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f5da1f3a6---37730752461.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/depadorez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=peranan+perlembagaan+malaysia+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_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 16584 bytes
SHA-256: bbaaa5006d10e356e09a27fee8f419bc0e3e5e90d478f3bd4934a0f3a4e56bca
font_02_sfnt_off0001171a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 10876 bytes
SHA-256: 9323d28463fea88c6bdfe4a9b587af5d80e9313fadadcbe963e135b7805a0f33

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