Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb72a92c185d348…

MALICIOUS

PDF

85.8 KB Created: 2021-09-23 13:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49f8909ce7fe5bb0d1bd4fa3d9a9911e SHA-1: 95d671120b2a55ddabdb36b9a370c45b429969f3 SHA-256: 7eb72a92c185d3484a54c038cc9078ee04f83dc886fd10ca60db5b7bcf9c464e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. This suggests an attempt to lure users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://photo-ostrov.com/ckfinder/userfiles/files/62028131817.pdf
    • http://exosushi.com/uploads/files/21306342358.pdf
    • https://orcasproje.com/userfiles/file/74785355485.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e63e5bd84088769be88d2930bb498da6/50115913839.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614029067d150---devilinurobajetovoxizedo.pdf
    • https://evrenmentese.com/upload/ckfinder/files/renukumezoke.pdf
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/5294812090.pdf
    • https://newsru.md/upload/userfiles/files/wukiguzapusasosomusum.pdf
    • https://infiniteprospects.com/FCKeditor/file/96391671189.pdf
    • http://audidalys.lt/ckfinder/userfiles/files/lelenorokalelijiv.pdf
    • https://joinvita.com/neu/userfiles/file/keguka.pdf
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/xolokajelutarobe.pdf
    • http://morakothotel.com/file_media/file_image/file/tirodesonudepinopinujigow.pdf
    • http://amidoux-peintures.com/ckfinder/userfiles/files/rugugobexofonemusos.pdf
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/8286210518.pdf
    • http://ahkjt.com/upfile/file/43352620499.pdf
    • http://risorsaterra.it/userfiles/files/lesasowobimejizewuvoreza.pdf
    • http://stluciachamber.org/uploadedImages/contentImg/file/54424331354.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/af5011bf510c03ebbb7c0f1ea5dd91b5/74765503451.pdf
    • http://xtra360.net/campannas/file/34180355376.pdf
    • https://99shayari.in/userfiles/files/68982533767.pdf
    • http://vatlieulamnha.com/media/ftp/file/9757620171.pdf
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/67838959173.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tropic+escape+apk
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb49.bin
9014baf79f1749927a4da06403471ff61e91dafca9e6570576e8cbe8218bfc9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB49 23228 bytes
font_01_sfnt_off00010407.bin
e3df47fb6908a33650bad833a9c0a54d9159e0df3f79fbb596e7176c2c0279a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 16296 bytes
font_02_sfnt_off00011a45.bin
cb3550ed9c54f138f7c5d8ca32b56391498a14c9248280ad0183b8ab68b54e02
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 10176 bytes
font_03_sfnt_off00013131.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13131 16792 bytes