Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb376379bf0ae892…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 08:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0245b793966a7dc6def38900faff472 SHA-1: d45da4419265aaa0a5687b4ea32845c7c41f76ee SHA-256: bb376379bf0ae892fb65241966581ae7f91917f6c98e1da294832c984578e687
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links indicate an attempt to deliver a malicious payload or phish for credentials by directing users to potentially compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://aminotp.com/upload/files/59727742346.pdf In PDF document text
    • https://rajatotogroup4.com/contents//files/mavov.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611edcfa03dcf---rawarigifofasebig.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/7460060194.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/24892289506.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1eb9dc113---40898416863.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lkpuvbukm35mgfbkj6ech9a7m1/73276703644.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/legasujototerapunitivigo.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6de3a045af1645572b8a2b07fa22834e/91773092433.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/pitaduvesi.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c3cc4294---buxitosowepipa.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/42321513459.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/wowojuwuf.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/5483179150.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/falolamokurifikixotivude.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/9497463342.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16077114e6af25---marewawalum.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/mudegonijerijor.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/ioh708q1p1l9jcng4trp62ka4v/rader.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/xibexexukugodumopexi.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f659b204c2986f983b583a87c827d6d4/buxapot.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaf02b2eac---zasizaxogumedevoro.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/kegorujunazi.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/bikavudakanekegugu.pdfPDF link annotation
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/7165dfd7ebac1f9e6519b92006df6a84/64808603477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=comparative+and+superlative+of+oldPDF 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_off0000c8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AB 19660 bytes
SHA-256: 40a5ed6edf94d50ae80785b112d8d180179ce9f219cf22fca8422a4a94ecee47
font_01_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 10856 bytes
SHA-256: d07270556a6fafe3ba1ffb4171df1528765f3dc52a08bc0032bcfe34deae03f7
font_02_sfnt_off00011451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1