Malicious PDF — malware analysis report

Static analysis result for SHA-256 65180fa113f6f3b3…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 11:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 259a91d616a15bf7f8b3737ca7f11265 SHA-1: 0f6f5b576ac1cb4b83e016a7ed151b5d4721dbf0 SHA-256: 65180fa113f6f3b30a1d44ff6833ef3ec1814abf5900c0299d70d6b25e9c28a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to lead users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=soccer+score+apk PDF link annotation
    • http://praguetransfer.com/files/file/maziju.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/99122921137.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/zenazevus.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/lomovafitetinulerofopoja.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/mumedazujizula.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/67583923916.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614763cd41c7d---deloxalonogilanolom.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e335536e00---94643290200.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/gujowugiw.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/vuribafizidoxobijotopowu.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/98756937239.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/tinabamomapogepobip.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613468e767af6---57477887823.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/31608599542.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/wedawinisus.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/jenabovapuzisawosufipizid.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/dewuliwafov.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5c863b6de---70608621510.pdfIn PDF document text
    • http://confetti-seasons.ru/upload/files/97299807323.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/putuvirugozaji.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/35244150199.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/pokulaxapevuwagitanuf.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_off0000b0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC912 10192 bytes
SHA-256: a97407104bb009a149ac0975db7fac0c793680137d5fc3ed34470a6fe73c324c
font_02_sfnt_off0000e004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 15164 bytes
SHA-256: 170eb58d8424a65a748e5dd0866451cd6f6a702088054d1f9b2b4c6b6bca8db6