Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc51fefce1a80fb2…

MALICIOUS

PDF

89.1 KB Created: 2021-09-08 11:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0b3a4cde3c75f691ec1cc1a37cedafe9 SHA-1: f686563f267327bf47f45aa524c776e7515b8303 SHA-256: cc51fefce1a80fb293d957d1d1f85ffff4e0c8e596d883087aafd00e08941ce8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, exhibiting characteristics of a payment redirection lure. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to host malicious content or redirect users to phishing sites. The document body is heavily obfuscated, but the heuristics indicate a lure designed to trick users into downloading further malicious content disguised as an invoice or payment update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/291845f41e4fffedac8b9a955db4fb3d/niradimupuporipatevat.pdf In PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/66vm0jiijq451e1pisnp166tm6/55977677063.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16072302317cb5---69480948100.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/24249690237.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/3343163235.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5d8889db6---37603219541.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a121eb3a---84393068106.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/25719595376.pdfIn PDF document text
    • http://teplospectr.ru/images/files/rifoxirapewofudufoniwet.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/mipetupodo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609a88e40404a---12066784515.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/boxufovozavimave.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4e6eb8494c78fe73699ee954fda8971e/goloxos.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39737414786.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/vokujebaroboni.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b8d3bb74a---92053583561.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/lugal.pdfIn PDF document text
    • http://bociany.sk/media/file/38968571590.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/aephddc20ea0hs3fbf36okl6g2/xabuni.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/bowilodusil.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/78406598680.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c74982e9d4d---malutububenajenilelijoma.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/merero.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/bjra658toj1q7o7s6col0fmdd8/vonunulilubovatupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=free+check+register+template+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_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F12 18292 bytes
SHA-256: b3d279d54da3cc9ae261906267c9ae0090f4bec437a52ca062ea8f9c227080f2
font_02_sfnt_off00013e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E35 10912 bytes
SHA-256: 1f747436ee59942a2faf3fe45f3979d5f4e79fe3c0f35be0be70bffc7255c352

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