Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da6ea303e388fed…

MALICIOUS

PDF

76.3 KB Created: 2021-09-18 08:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 720728ab233550794b1b13c348376cd3 SHA-1: 228aa6fd2ad2d307b3f15e29b4db9587f7b4ef02 SHA-256: 4da6ea303e388fed1b5fc807a14f768d2a0a2995438a6cc78010e31b69b7598d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs pointing to potentially compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8531

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=fortnite+smiley+face+copy+paste PDF link annotation
    • http://benetworkingpro.com/ckfinder/userfiles/files/48234260548.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/8335152384.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/64793345380.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/35898593851.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/97682145559.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/46301708373.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/medasubu.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/098925246108be20bfa11e6ae95becf1/9091700106.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/136056444.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/rarenuzibimapiniwe.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/fugovodanijunaxoxune.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd8c4debcb---552747210.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/60616378565.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/xegimaganunovugev.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/lujarejunakupezotabora.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/amtfkp8rgkdp76434mgc7lt4k0/jaxefavotupuxuzu.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210907_012343.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161423f3d2947c---jazavadowewixijotujute.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/14884707132.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/latomag.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/xukulinovajasiguwixiwibe.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/fuwox.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F1 10732 bytes
SHA-256: 7b2dc45364d6a99438d913b10aaa4f4a24ee490db0a0a1ec8fbc32ffa68c3004
font_01_sfnt_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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