Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b2d771c82eda66…

MALICIOUS

PDF

70.2 KB Created: 2021-09-22 11:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2a3949a8055b289e8b6314e40652451 SHA-1: e22b0953ea327a510f991cbb44d6d7f7b1c1d0fe SHA-256: e1b2d771c82eda66c14b6abac2d59f88330164a0bb74f902a0427ab510e4b10e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=cara+move+app+to+sd+card+android PDF link annotation
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c56cdcbd4570251b8ee00a8895f33011/60278439062.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/zurojobar.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/75333595923.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/paxox.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/33403091894.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021913161022346.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4942019930.pdfIn PDF document text
    • https://kiptep.ru/file/fiwukavojotuzusu.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/51689626016.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa8472ba61---nofinasilegeboxuk.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/sidirujepalabo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614118e25255c---falamujixikenebivexuv.pdfIn PDF document text
    • http://climtech.com/files/files/95418818169.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/tisuxewinazojog.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/sifutaze.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/kevonotomopawosam.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/fukiviwamumilavarojutifo.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/61474216024.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/zavogevixurapikanesutu.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/tosuzadibogegedoxefameb.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/vexanuvabedajunaveladu.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/30278055755.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/83555914649.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_off0000b368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7A 15460 bytes
SHA-256: fb39c6ef3e3382e6918d140b27c7e0195704d0cc427d2bb2ac29ce43050f2c89
font_02_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 10728 bytes
SHA-256: 0213c66525ffedde107a48b1b7e594fc8a7dbbd7e43d4fe34fa0bf1832ff82cc

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