Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bacc367da36abb…

MALICIOUS

PDF

88.7 KB Created: 2021-06-27 10:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 745f7e6934be73913cecf465e9947c1b SHA-1: 3f05d135feab3be04d238db46b87c6d80995d420 SHA-256: f8bacc367da36abbfa605ea11558899138dc8404468a3ee80812243c0d8d82c8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kfbi.ru/content/file/kenedo.pdf In PDF document text
    • http://madmojo.com/fckupload/file/zuxetofuwuxixutadu.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccf136a16---87163741141.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b829c96d713---10440464085.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dc9c29d8---20620140860.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093f6fdb7cb7---16599586705.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2158dbcc28---89321632449.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/25343732838.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/bitowadizef.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/48ef7f597f5f66bba68dea685d2fb453/33862547633.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab30a793d7f---winajapusowezalibujupe.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/g188f27lfirvj1hv507nrd1gv0/kifebosaniju.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e821ea0cb---89305633415.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/59792224010.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/e87cj1gkckv93h5tuj51q5dv6i/vajupiw.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/acbde84a49699e9c3fc3aeba0f8ab45b/22920568923.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16204359390678.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/35885573853.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/82197141582.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c031455ed78---3490200246.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/43440864111.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/kafogeb.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d141cd7bf---besonunupewuturitej.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b0a0918198551e33671116a407dddc03/88241265531.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/052dadcac6ca6ffd871e69b4941f14ce/newevitawekiwovupigawekad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+long+does+it+take+for+a+speeding+ticket+to+come+off+your+recordPDF link annotation
    • 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_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 11348 bytes
SHA-256: a79c4976f87cd3288fcf0d66463eb156d8672d657229e5ecde4e85bd837779f9
font_01_sfnt_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12836 17156 bytes
SHA-256: 7b9b6c7054d08d62aea67778e7d91e21a9529a8bc991f5c79f9572e84d317156