Malicious PDF — malware analysis report

Static analysis result for SHA-256 4130109dd82509cc…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 05:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a654d4e3acea2babe1fcba74b4008b3f SHA-1: abca8d40c96d58ac9205cc71a36961adfd3dddae SHA-256: 4130109dd82509cc6a17857f08a6ae5b5f0b8eb0a8abbde414bd11f873ad0edf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crewmak.ru/uplcv?utm_term=best+pokemon+emulator
    • https://bursakaynak.com/userfiles/file/pewala.pdf
    • https://windfreeklima.com/upload/ckfinder/files/jezozerabopef.pdf
    • http://dekoblickfang.de/userfiles/file/58467387168.pdf
    • http://geredekombiservisi.com/userfiles/file/95344801167.pdf
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210909075110.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131b393810c4---kapilazabixipotawile.pdf
    • http://avandcie-automation.com/ckfinder/userfiles/files/ruzafedalu.pdf
    • http://tiquital.com/documentos/file/1192899758.pdf
    • https://tramhuonghanoi.vn/upload/files/vezadoju.pdf
    • http://righetti-ticozzi.it/userfiles/files/texazoduxuloseb.pdf
    • http://kxqcgs.net/filespath/files/20210902195504.pdf
    • http://ahzgbh.news-read.com/upload/files/97681167501.pdf
    • https://srldirect.com/ckfinder/userfiles/files/63652933790.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6bdba4961---51824883198.pdf
    • http://medicapoland.pl/uploaded/file/76717286776.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7e4012d24ef5245f7529eab82de9452d/zifatilomijugowe.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614540138b196---xusetibiwowipimezegabaw.pdf
    • https://techson-cctv.com/upload/file/vadunepitoraxofovo.pdf
    • http://jamalcar.com/userfiles/file/rorinejolavemode.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613582cc682e0---tawunaxatudotamabezaburiz.pdf
    • http://kukdae.com/files/fckeditor/file/44941748351.pdf
    • http://reklama-kemerovo.ru/files/files/mafunomagogujerawirukilev.pdf
    • http://parcroyale.hk/userfiles/degedibezim.pdf
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/90439027610.pdf
    • http://inimtrento.it/userfiles/files/63008588597.pdf
    • http://dobre-jaja.com/Upload/file/fakavovolezukotaw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4f6.bin
666f38e5ea45d99f4d38dce7e9b6f9e47bd1f7bedbccd7f6022157f5f8e35a4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F6 10564 bytes
font_01_sfnt_off0000dd1e.bin
4b75b01bc58db7b83861bafe3f512728ebf401305f52873d352b4d79169d950a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 16796 bytes
font_02_sfnt_off0001088f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 16792 bytes