Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4f2e73c4d00c3c…

MALICIOUS

PDF

104.6 KB Created: 2021-08-09 23:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a55fe1c5b2b4a39bfcd7f048a6102c6 SHA-1: ab05b7233a26ae5dd922197f224fadb74c411466 SHA-256: 6c4f2e73c4d00c3ce67f412bb7fd4fd9d88ed460b69de8492d5a832ec4e72078
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://pistant.ru/uplcv?utm_term=pass+rate+for+step+1 PDF link annotation
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/aa1c4f7ed5dfca1bcf7bafe1f95276ab/bejirozujipefogek.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/17719509539.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/dobaruxexiregabun.pdfIn PDF document text
    • https://windsbs.biz/files/file/xebenezok.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/80839180364.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ogkoqru9bk0pjdiv1d73hmqqan/tubopasikixenuw.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077193e7280b---93731463895.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/26123880942.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/kakokibolilovitetuka.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/23919623582.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/zajip.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cd8b8a288---kipedobifegawemonuwaveg.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/rodusabalesi.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/16104797776.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160882ab32f6c2---98807907290.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a5877831801---mibutenozavevuta.pdfIn PDF document text
    • http://resicolor.com/upload/files/30434406675.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/19/file/20210719_141757_197.pdfIn PDF document text
    • https://isosklo.cz/uploads/41243061213.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/vomepotubapelejajotofeba.pdfIn PDF document text
    • http://dgjst.com/upfile/file/gizefima.pdfIn PDF document text
    • https://nasikampung.info/contents//files/paxivanigutizarufoga.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/wuvirut.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/78326936257.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_off00013785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13785 10164 bytes
SHA-256: 3ba683f59d4acb531c9d0ec63d2f136885f2e0b509a61ac40722fcb46d54f587
font_01_sfnt_off00014e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E7D 17916 bytes
SHA-256: 96c9bbf7b79b78e51f8325c1f27bb9bf02140c3a9b62d9f6c212c7144096603a
font_02_sfnt_off00017d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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