Malicious PDF — malware analysis report

Static analysis result for SHA-256 34203919df22a8f6…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 12:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 504935dd42422ef803a1a1e552f614db SHA-1: 2a19260192eb18ff4732aef9a1280dfebc6972b2 SHA-256: 34203919df22a8f616195cb329cb0b4486fea6f2cea55eb5a5d15d64c2642edc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting. These links likely serve to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3234406eb---96431426080.pdf In PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210817072748.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/168cc0f74bbeaee70b1e7a0e36eae5ad/rapofawakibeketu.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/fivikunurobarujimazonut.pdfIn PDF document text
    • http://msiutilities.biz/documents/siragewajibutonaxa.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/c1ri0qnm41k84er85d6f90cq5d/36723327125.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/m0neo4l54qqq6jaadp0vshjhca/padinikikodiropivo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35a63cf30---ragoxukujeguze.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/24621623607.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b0ea4510---1122585377.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af9df8c4d28---merumuso.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/taxaludonolebazarawek.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/11457219087.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/88d16f98162ff03908769d2ee8b9746f/wufiwolutex.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d359ff620a7f1c2fedec174a1984061b/29612468743.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0c2d29f4a10e20c8ce36e28715b6ee0a/94036578910.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa10ae4dec---zagidoxoropuwomuj.pdfIn PDF document text
    • http://lucann.com/Upload/file/xitiwukegoganejejafuf.pdfIn PDF document text
    • https://digireg.ch/upload/mejibovedat.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/denawa.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210723084845_m4henr.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=current+affairs+september+2018+questions+and+answers+pdfPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/83331673061.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_off0000bca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA0 17720 bytes
SHA-256: 2a1b81260ddea723c1647eadd65acbbafcd2c498b2864792373e1bad15ddc9a5
font_01_sfnt_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 11616 bytes
SHA-256: e51987b7d661840a5d3bc9f9ed1bb0b20c45b1997ae8f9464e9765f42fd3085d
font_02_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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