Malicious PDF — malware analysis report

Static analysis result for SHA-256 427942afe2aaac50…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 11:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1f902e855750306e8cd96e454542313 SHA-1: 9d7c75ce9bbe767cda0550b7cb56cddacc3e7f54 SHA-256: 427942afe2aaac50f18d456efad634c5fd9c6e189169544dd33e005ebe934d8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URL analysis confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://alistairmills.com/ckfinder/userfiles/files/vagunarapol.pdf In PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161388df53bc85---dipasubidiletizaturilosel.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///16750272974.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/monajiridipigevijupod.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/e64565d8a1c8958ac27b25d7578ca297/maxafaruvekukekejox.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109080310214424.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b31438450e---6500428520.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/lezowitetoz.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385ddc0f2d4---pabutikonilewona.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/lubuzevox.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/29031838628.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fc2290ce79adc82eb1d8bc9d5ead75ff/pakuseru.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/84117009346.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/kisog.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d49cbd0fe4---zunorotiwegafilupatut.pdfIn PDF document text
    • https://mfdesign.hu/files/file/15369073196.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/18253037607.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/mobadude.pdfIn PDF document text
    • http://sinostandards.net/upload/files/72682322408.pdfIn PDF document text
    • http://ojazzdance.fr/userfiles/file/81324061001.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/jigumipitaninapawekadaxen.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b88199d3d1---77768541874.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/gelexamalafetig.pdfIn PDF document text
    • https://angem.fr/userfiles/file/rugisagitukex.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/52839634207.pdfIn PDF document text
    • https://teamcode.net/upload/files/76073301394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=clue+apk+fullPDF 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_off0000cd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD17 9892 bytes
SHA-256: b60eae0951d7edd0b972a88555acadfa9ad68dc47b79c7207e0947ba2ced2dab
font_01_sfnt_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 18852 bytes
SHA-256: ad20f0ed7aba5276062e3f5de8cf3a5a44e2b411f768917317c00bef0f52c93f
font_02_sfnt_off00011386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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