Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4dcb7002160d48a…

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 12:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e30a90b53152e5163aa956d8df7a36c1 SHA-1: 652c1bcfb576885cb2853916699e351a2c45ac0a SHA-256: d4dcb7002160d48a4c849202889ad06b4f38af75b35d448d50f2f1c8508c9455
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0b839eefae6d84cf42172589aaf8db39/59529551427.pdf In PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/varupulafuvubusibikani.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a2d08198b---67564759210.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085111170847---faxeferoporituketazeje.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/440001023.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5s307pq21g44012n0fccc956s5/82849482006.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9d2e2f44e28112c4e0a242e4084a39cb/94865055910.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc4614d62a---jubibimujitodilubaxevu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777f9e1a0f2---68648442725.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/22654266532.pdfIn PDF document text
    • https://cape-electronics.com/media/file/79184612941.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/1ea7221859284fc0e82fa95b5bf3ca13/jitimadinonijorilogililif.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c69844e448cc2f4fe4dedaef584d4cf9/rokozidekuna.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/90974918221.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/jifebubilamexi.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/11391841262.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607543a485ea3---68900367724.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/25b376ada7da8aa135180822aa4e39c7/bojelenelufuxexixiworuk.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/11130315789.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/6278896670.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/96a14c59afd1429b808477c865447187/16933739078.pdfIn PDF document text
    • https://nada70.org/userfiles/file/nalub.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/53520311164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=manual+cnc+fidiaPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/eee0570e7a99d466cc2ab05a582da8f7/wisisower.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_off0000bb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB06 17728 bytes
SHA-256: 35c673624c9c58d7ba69f6746fade166762827ba3ede22c6937e6b5dd4dbda1d
font_01_sfnt_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001010c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 9944 bytes
SHA-256: e52e44d70bc7fb515c3cef5bdb74b564aaef5013d82ed448e14117bbbd1d6ab8