Malicious PDF — malware analysis report

Static analysis result for SHA-256 e809fe5fb226b330…

MALICIOUS

PDF

79.7 KB Created: 2021-09-24 05:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99e40b044925343e61641dbb387d557b SHA-1: e6cab902a56f5b2fb204427314665734a6be6390 SHA-256: e809fe5fb226b330d67f19b8f1fce478961276f218a15cbe2d1d1c0acc2e0d3e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://emrc.ie/upload/imagecontent/file/weminomo.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16146dc18c1aa0---xagolemuguwusulokadisafo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161407b5d25dcd---39141578333.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/mogejubawositerorosowesep.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210912142756.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/kelemowujemosepupijug.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/50573793447.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613db76b37a5a---futudenonemumeri.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/40924563591.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/pixofeku.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/64458939914.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/43138962363.pdfIn PDF document text
    • http://kaies.net/upfiles/2109060653099636486kmfa7.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/24775762147.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/77691955370.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/77883625452.pdfIn PDF document text
    • http://peak-experience-japan.fr/images/blog/file/wisofotidiraxawi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130bbe7bf9a5---nixizadu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148be2db893d---23394637292.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/52171837494.pdfIn PDF document text
    • http://co-mit.com/uploads/files/60683809103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=10+random+numbers+between+1+and+100PDF 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_off0000d449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD449 17052 bytes
SHA-256: c54776fc50ba8c2c1132b9d5cb1aa2455d9e8b6d5d56a4cbc138277c6d1b0468
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 10676 bytes
SHA-256: ffb49a8f04c2e9dda8a5d82560a5d8f36f587b825a3e29375f27009d5ef7f990
font_02_sfnt_off000118f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1