Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4ef553297e6d53…

MALICIOUS

PDF

71.8 KB Created: 2021-09-13 21:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 17083d5a044fceac41cb76bd6ece2170 SHA-1: a1152c00257e939087fcd458cef535c4e4e50677 SHA-256: 4c4ef553297e6d533aaffeebb60e74c58801bea4b64a87f137ea737d85d284e3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, likely intended to trick the user into downloading a password-protected archive. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document provides instructions for an archive password, a common tactic to bypass gateway scanning. ClamAV detection and ML classification confirm the malicious nature of the file, suggesting it's a downloader or part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://prana.video/wp-content/plugins/super-forms/uploads/php/files/hq5oo3nf8ucs0euthuaqrlje34/92191043371.pdf In PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad138ea37---98497074456.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109130503361533.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a870be6be---33467649411.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/lavofitufenagejebozena.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/ludedu.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/60972568480.pdfIn PDF document text
    • http://abnicum.com/files/file/11237134448.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b621bc5181---juwupatajogonepi.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/pofoxetoxalanozafofodor.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/paduruvasikorukita.pdfIn PDF document text
    • http://elitk.ru/_files/22058480219.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/zolaxatofuwadewifedadawox.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/nidejijifekorizes.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/90414359139.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/78267134934.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/70616900471.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/pevisaz.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/gerosigekilukaxuxaf.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/7458133195.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/fuwodenegog.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613819e61e7da---11822604022.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/sadunegudafo.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/guzukakopasojikure.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/kewizabowozozezuvo.pdfIn PDF document text
    • http://indexone.ru/upload/file/noponuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=como+ver+la+contrase%C3%B1a+de+wifi+en+mi+celular+androidPDF link annotation
    • 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_off0000b78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9F 15124 bytes
SHA-256: c9b375982cda4f53cce110dd3546ee44abbf2c05160b6273b8c9657455abd8ae
font_02_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 11128 bytes
SHA-256: d2607aef76bc8ac0d90406a382cee00bfe3d0fb0a5afb8d0b5cbdf935ae45fe7

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