Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3465d110ba831b…

MALICIOUS

PDF

83.4 KB Created: 2021-08-20 22:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3650cec7f4053add657fb5bb0527efd SHA-1: 59bcad1752efbc409302bc868cc3f257cc9aaa4d SHA-256: 5b3465d110ba831bf0a46700125e98e4685d324900d06e776bfe3b8a0e745c92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://crysiq.ru/uplcv?utm_term=liquidation+report+form+coa PDF link annotation
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/12f27ca951f26a956c4c8c17d94607f8/50975503563.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0244094926aa7dbfb684642496d14c94/penimenarajevaxelovavov.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c31d2ccdee0---kipovowevatulipivuresos.pdfIn PDF document text
    • http://blueyee.com/upload/file/080629141881.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd6a78d849---daxabulewuk.pdfIn PDF document text
    • https://filetorme.com/upload/files/venijigefemenag.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/mulawafidusugonoba.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/770e9003a9b4090066280ad2fa59682e/57861289291.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/dapukadamavigupuk.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/sewet.pdfIn PDF document text
    • https://pichsas.com/file/vadexebodedobuvojukavaj.pdfIn PDF document text
    • http://rc-modeller.se/images/file///25560778503.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/xatexulokanutitimavaloro.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/mm6odku1mdr1018aa49mdjab9d/bugexekusevijojokifuw.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/91252511424.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/jujunijosobenubuwujowa.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/47509074449.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1288936242---18978504179.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/nejisezukemu.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/32217939235.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/82445721843.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/vozudorotukewidaki.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/26117519668.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/4dscfhg0mtlilcic5m5aeniseb/pomebilo.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/99114924450.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/zadolikodavojojetetu.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/80298682714.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_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 17284 bytes
SHA-256: b5799f6cfcf193ebd97ffd54d4c5fdee814afa92d9bf572269863b134548501a
font_01_sfnt_off00010e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7B 10768 bytes
SHA-256: 4b21225aa09f911d44946f03149fa2bd816cea0479afc54c7ecd8351b272ec04
font_02_sfnt_off00012700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.