Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da09659a689f2ef…

MALICIOUS

PDF

80.6 KB Created: 2021-06-21 09:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 065abbfddff2d60b48129db1adcc95dc SHA-1: 8411078f46e24d0a7e86a5c15c75126496eecfcc SHA-256: 9da09659a689f2efdc2e6db6ba09a657c6cecf23ce9ccf211def2ad6fa824cb2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress installations. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs likely serve as lures to direct users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/c3481dd229d0e82fdc49bb94d389f239/3243862690.pdf In PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/7035a5e30be1770161ce41399872d20e/fobeguzexagalogiwev.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/39850932717.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/coc4hlvl4aahenhlos2jq355t0/seregulukimapobekine.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/hk7348hr4c1jrjvlghtdrtrkp7/fogur.pdfIn PDF document text
    • http://princeverma.in/uploads/files/39456177164.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0b8c92e0b899fc7811a84d3a8c1f4a16/bururunanunetajulox.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fef6081973e18a57452eea8d5ff7a6b/vejebumawetedevijadanagen.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb7fd1fc7---76559701065.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5e1debf9---94951354482.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/50608400363.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/62138542488.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/wenesasawabavaze.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/8h5s9eqeb2km5nah6ke6km0bf1/14414015362.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mcu+movie+list+orderPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 4716 bytes
SHA-256: 6a1025bf44cc1c4ae0f7464774e686e9d82a3fad66a122a06b2b530587b23345
font_01_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 10840 bytes
SHA-256: fde46dcceb211341724d45f00ea7c1a30c643e6f329697f6a52ef3eb9442f0a9
font_02_sfnt_off0001263d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3