Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c07fbd83778e44…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 19:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d8a6b4bfee05b3c4e48101133bad1eb5 SHA-1: f9fcb1b28cf48d51ce5e3def8060c4410316e67c SHA-256: b6c07fbd83778e44f0d04b523c1d0d71cd691263515d29aa5c733f3081611e03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic. The embedded URLs are likely used to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c959965fbb---28173133475.pdf In PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f33ac362e---mogerizajoreweli.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/suropamowuti.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/45494368028.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/bubidamiwunutew.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/434a5d87673bb0d9a2ebd5199afc2b96/23618595237.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/gimaxawojazofulovuto.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf522b902---36412112933.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/7961185109.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1610d78c136ed8---58590319995.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/2h7bfgbucrk5td12ja1r2bk7t3/sasenul.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/94987530016.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/98291666182.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/ratiritinidevanovibowak.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2740a7eb1---24978064123.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/67494605825.pdfIn PDF document text
    • https://intellicapital.in/ckfinder/userfiles/files/gikolupiko.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210702030520.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e74f83f88---87033889453.pdfIn PDF document text
    • https://digireg.si/upload/xawiwoziw.pdfIn PDF document text
    • http://mav-auto.ru/images/file/xaxikilewajapenoxafow.pdfIn PDF document text
    • http://byecook.com/ckupload/files/31498049487.pdfIn PDF document text
    • http://kgmda.com/upload/files/19456147954.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607680a6782a5---3513178273.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f174b9c09---zigojixefujoxiviwawonaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ganga+action+plan+project+pdfPDF 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_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 10796 bytes
SHA-256: a885dccc1a2a40bf7bdb7ccf0d22eca9b5f2a9625c23679d938df13b1d77c0a7
font_02_sfnt_off000113e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E5 16160 bytes
SHA-256: 95bb9f03d46c4292ddcd96b28762fff2a1b4bb900b241ffcc77b5d8a379d1f7f