Malicious PDF — malware analysis report

Static analysis result for SHA-256 778a490d8ca7bdff…

MALICIOUS

PDF

91.4 KB Created: 2021-09-04 02:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e16bf419147e93658cc2108208c75cc9 SHA-1: f13bdf583df60dd7c89c0f6f96768006a91078c5 SHA-256: 778a490d8ca7bdff25a6c30b2fa10800a8bfa525beb0f2020da03063901860c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV heuristic specifically flags this as a 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4066

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8c7c0c094c416f5e7b1d1f6d368a5949/6501829256.pdf In PDF document text
    • https://agatanorek.com/files/file/7096618004.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/457157673.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/xebigisifam.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c188b27a7fe---59712431916.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/jedumoxasogedezu.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/82311927558.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/42008890110.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bf511d9ba---30279257656.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/jepitadevawatiwebewiki.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/lefakazozidofarigigum.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/44439253461.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608729a9ef6e4---xefuv.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/90860485280.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/57461550934.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/10472071952.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c9304ee3826f6d96f7b440dc6d941add/kimaxitikaremuvubur.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/e8gjedjurothqsv0ehfal7lkn3/70880531271.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/35df49fbcf970990699e41685f734c06/lodovonozug.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/r279stj7j1js7lg6ek154o7km4/wolitefetamoxusutadog.pdfIn PDF document text
    • https://dom-titan.rs/files/73060236498.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/08v4thas552lt7d1913vai04m6/47369984334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=livre+physique+chimie+terminale+s+sirius+2012+pdfPDF link annotation
    • 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_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001211e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211E 22656 bytes
SHA-256: d00024ad5505441c3eeaee21ab73ad91959d0ccae7e03596df83de73d62ef52c