Malicious PDF — malware analysis report

Static analysis result for SHA-256 645c7f3283e0058f…

MALICIOUS

PDF

114.0 KB Created: 2021-06-26 02:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 32af9328039e91a79c882018c551af4c SHA-1: da51fcb11f2072591a349632358de7a4084cb2fc SHA-256: 645c7f3283e0058f22566e72aa4c7e2e6d487b15fd9954dea2487320fb2e890f
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 identifying it as a phishing trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a focus on external redirection, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=stress+induced+psychosis PDF link annotation
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160d6457734f90---51921683076.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722508f04a5---bupivefifojesesefirorogur.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c322d435931---74732040659.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/51788569873.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/24190060769.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/daa1f912398031237be37554f47098c0/83001390763.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160985470bbf97---vajanigepiwu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608687cb65960---kepebakovegu.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/toluxisuvixu.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cbd4320ab---84917944046.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/5204624668.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/21611280171.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/geburolo.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/55186357283.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/cr84sn3jcb5ikt2qj54c9nohet/salotanoze.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/66bee88bcb10c1f91176b6f523f1c3e4/golifur.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/1d8lk7lj7uvsjk6sm4opjt0a16/suvujukabamitasimexipu.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/notogemo.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/34gr3k95p6frpmpknaj9cle542/70823886069.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/uk8iibtpon1te448aiomj987vv/77534132563.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/50857680271.pdfIn PDF document text
    • https://steammining.com/userfiles/file/tominokufagiwaxogokaduwu.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/xukuluzabekixusimuvibuw.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/c960f7da11e52c0fae98a4c0bf4b4fb5/vezopowigus.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_off00015d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D73 10692 bytes
SHA-256: 328331dba4a1836d0dc09bd27e907b764119c8fe6568d21bb2f358b747c16ab0
font_01_sfnt_off000175df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175DF 17132 bytes
SHA-256: d5079ca6be856af59fa2b352817459e1b5cbd6a9abb8bfc05aa5901ad3f1276c
font_02_sfnt_off0001a2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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