Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3dda1bff47f121…

MALICIOUS

PDF

87.3 KB Created: 2021-08-10 20:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e47ac991da46acacae6ddbeaad408dfc SHA-1: 61cc78c6d8ef6c151ec1ed5b314a0f9e03cdcb62 SHA-256: 3e3dda1bff47f12184f810627773cf983f43447a36a2e98ad23312317c79a312
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to download further malicious PDFs hosted on compromised WordPress sites. The presence of invoice-related language suggests a lure to trick users into downloading the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a48aed77d0---pepopewilosetixunufiza.pdf In PDF document text
    • https://psychologgia.pl/Upload/file/besilafitoni.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/35ae9h0cbpjoj0kum0lbvkjk00/jamudilatukokojex.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/90478677286.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935160c4ea5---ritadenodofefuki.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1750140df---ripikamijamuji.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/pewoziruvupoxesekuzojog.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/pudeni.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607945196d9f9---gusazifapebirupuguji.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6a09c5623943f4949a58e010ddba3f41/jusixoxuvikewalojew.pdfIn PDF document text
    • http://standardamulet.com/files/files/18163724219.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/moromoxulud.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/fozeravugejetifodev.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/39854542845.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/puwupo.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/bipulon.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d5d581e76569a0046ce186cfaffbe900/77436993921.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6oj579mber5ihctm268s4mrtep/rebisibegoruxegidovap.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/32404224286.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57f4aaa536---vurukozumoxu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6031d1a2b---48782474291.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021070713220280554.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094856b819db---84570894806.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160901a4129d15---95819443134.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/valijevitujul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+is+the+responsibilities+of+a+junior+accountantPDF 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://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_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 10940 bytes
SHA-256: 0b9ef2555897b24718565f5ce4449f58f2d788b1793d39765522916d32269e9c
font_01_sfnt_off00010ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 16468 bytes
SHA-256: 1aba0c8454faa0e8abb2cfd7894058010b894cd84f6468a713fd7e007739e356
font_02_sfnt_off000139b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1