Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2c5d39099e2de1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 11:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f659887db06ff36a2035df9f9e4c4bf3 SHA-1: db461ad3b6e7f26c66dfeba8b57fc6a1436e464f SHA-256: bf2c5d39099e2de18cc1516250ab7eed5b7a8af252a740154a9f86b2e4bb2a74
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to link farms hosted on disposable or compromised domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.premiumimport.nl/ckfinder/userfiles/files/bebedijeserojalidasa.pdf In PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9da4f8c286---donosutagedugiwigiw.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/61711011897.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/6268319753.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/pulafuw.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/fepitutoregoranipikupi.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/nijizafozovosefa.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaaaacddd4---vevedexikabetudozijalo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f6301cc69---87218692507.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bb9c59bc---jolij.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/lagufurovuronajowepom.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01220b9eb3---pudesomire.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb0668784---71121880360.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1ce9b4a3ab26c3cecfad6f7e8740509b/karegefeworiko.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/15363058459.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/93243248727.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/a21a8cb2d3527dbe86fbb3c6a8496e53/42263183348.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/21ac3a6972f3f97d0e0af34e1a1ece6f/9341161325.pdfIn PDF document text
    • http://kesifveotesi.com/files/xebexuwaregofusife.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/taturiluvu.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/dotit.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/fb800cfd86b0dde8549940dd1c7189dc/wesik.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/jikefiputaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=measure+king+manual+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/bipitibigigigajul.pdfIn PDF document text
    • 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_off0000cf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 16064 bytes
SHA-256: 9708c064772774615fee620e0f49b5d161e339181240b8e1e6811d0b8c65f8b5
font_02_sfnt_off00011001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11001 19040 bytes
SHA-256: 20e3ebe8dd29bce2b810b2e8c0a250b6b703e539b565e148107d0ceefb22eccb

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