Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb04460e50d96d02…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 21:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7c6e9dda9497a31f7a7a7f0cfdac1cf SHA-1: ea595fc5285ebd51b18326fda697dbcdb6a130a0 SHA-256: eb04460e50d96d02c905bf3cc80065e3e8ff4915ead7a0bf56f785c5d80f3587
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external sites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of embedded URIs and the overall structure suggest an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nomylo.ru/uplcv?utm_term=emmenez+moi+partition+pdf PDF link annotation
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608af50b2f69a---95959177758.pdfIn PDF document text
    • http://philboyd.com/84425348496.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/fulimevazipo.pdfIn PDF document text
    • http://allasclub.com/campannas/file/forekurode.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/sovoxivirugeditovak.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/tovadebero.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/19063607827.pdfIn PDF document text
    • http://byecook.com/ckupload/files/febowofavafanolijeparuwa.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/firexibokeraxapajevomuko.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/tupaxawitixozaled.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hj74ul62nhaf6717ne64g908so/penixi.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/mokusinivexosupinonofugod.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/17270111799.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/98689380574.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfbc486e27---36047360606.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/fifipefe.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/50665645234.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739d06906b6---99278210585.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5582736426.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/fa40f7b34c6d18578e430e75154e9c22/13907409604.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095d190c6b22---4533967068.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/bekowewobejomusu.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_off0000d38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38D 21188 bytes
SHA-256: 85b0f8e7478975b9af0042264b97e80355a56e2b312bb371d4d15f328d974553
font_01_sfnt_off000109d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 10488 bytes
SHA-256: 768cb39a091cc99b206ac38319db7abdc204a4a2c71619bcf151db00b5fc4529
font_02_sfnt_off0001219e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1