Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea766a4438bcac8c…

MALICIOUS

PDF

90.6 KB Created: 2021-08-02 14:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 21e566f64e477f7539ef564e5115853f SHA-1: 22842219169334a408d9bc908949fa6ecdd48a54 SHA-256: ea766a4438bcac8c661a8dd5e98563a0c0e5a72dd633a41db97c101deeb57d14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a link farm directing to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL analysis suggest it's designed to lure users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://noticky.net/akce/fotky/file/lodakodorid.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ec2812962---xojabemur.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae35e29ed---zanelo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eeb6640b0---fugutatonibanefal.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b021a737707---18264355861.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/32633480959.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/jafefigovetekugewul.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/jufosuzawuvuzu.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/mowubuxot.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079160f3293f---nirudalipebofez.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/636f4099859f42e617dae247ac820814/wefopakes.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082eabc86077---74212593774.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/magofotififaxusakusowege.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/kowax.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/49e6fdc39e57db972d17702bd2e69078/21546798277.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/gtm9cdjpqctp32btkrlt731dc0/35059933228.pdfIn PDF document text
    • https://techlan.pl/files/file/kojowejonebopesonomat.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/fapaku.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/luxowof.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/24252526838.pdfIn PDF document text
    • http://traviet36.com/upload/files/subarubob.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d43f5c34dbe819782d32b9b34d38ba1c/kevakefolu.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/xukam.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/48406601593.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/87255607358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=basic+malayalam+words+in+english+pdfPDF 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_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 16732 bytes
SHA-256: e3aa6f14c93a5e4cb8c383bfbb1639a5461561da1724db1edd6dad2abe58a932
font_01_sfnt_off00012926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001413d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413D 11224 bytes
SHA-256: 516999780315a956c77cf9bdeb56eb330642058398ed8be95fd48e3405d8193f

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