Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c555486679fda65…

MALICIOUS

PDF

87.5 KB Created: 2021-07-03 08:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 030d830810c67b29c212ca76111485fa SHA-1: bac1846906953ba66a3158d6a8eee75eb1f6fc3d SHA-256: 6c555486679fda65441252967c44cea08f55497e8a3932108671c2832feb6661
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims into potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=james+baldwin+no+name+in+the+street
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf73ce2917---59654947833.pdf
    • http://etasystem.net/userfiles/files/rabametojak.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160824a67ad10f---busijajila.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f26e8501e9d267197f4e61e94df3716/dovigagosuzewutak.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/oc3q54b15va236vgbn4tqf8s65/3831585726.pdf
    • https://vsetinrally.cz/userfiles/file/luvup.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/80b22d11633adbf334c45cb0dd30a836/21655422423.pdf
    • http://com123.vn/uploads/file/6093128250.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa4c3a3272---juzavarup.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/7k34h71qfr1n9fp5kir2pnoj87/61523922691.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16095c8c03996c---zumudasimefi.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad37504bda7---watopumatovegiwanapimip.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/21384513004.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070e4de281a3---sezagegukekip.pdf
    • http://besttailor.info/ckfinder/userfiles/files/foronikonikeb.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e68606426d---towofolifonubumafota.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e407a89ca2---xilupozak.pdf
    • http://stressmanagement-karriere.de/userfiles/file/72103728605.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4797c094d7---17226437229.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 16792 bytes
font_01_sfnt_off000107cc.bin
4bbf05569835a2c8f57aacf55df0fdd0bcd134578ff73307d91718e15c6e347a
pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 10728 bytes
font_02_sfnt_off00012041.bin
1b749d33b7448a12258ae7fa0e1f47f209c5bf39f2b8ea0004b9e7d7a8db4f64
pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 18492 bytes