Malicious PDF — malware analysis report

Static analysis result for SHA-256 94385c7f71cf2221…

MALICIOUS

PDF

97.3 KB Created: 2021-09-08 01:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17c0a39646f396082d82880dd9c0b326 SHA-1: d4283becc5d14e8dfcbed7633f84f6ae271b0d70 SHA-256: 94385c7f71cf22216f8fac2ec4a921da66d355212cb26dd524f59e9f98b12d67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to obfuscate malicious content or redirect users. It also exhibits characteristics of a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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 https://pistant.ru/uplcv?utm_term=campbell+biology+9th+edition+free+online+textbook+pdf PDF link annotation
    • https://m-astar.com/UserFiles/files/zekimumukivalesud.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ecaed151d---41419519499.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/mopovosikosetafewek.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/kepapegaxulinebu.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821e16124d0---22318897376.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/vugupobu.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///gawobetupogifinalimopura.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210511075642.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/vih0178g4mvsekfmqvj4a610hv/zujojokapupabarawit.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/44858688226.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2227d8fb90---56356449552.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/49482990467.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/fibubevogusaparixutabal.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/40629586937.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/kilowelebaruzaxalusevu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160846996e63ea---40858355534.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/20774975654.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/nojiwozatakitadizilanomu.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/famusikad.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/tododarexone.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/95277427473.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/roxubavibose.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6ae8a4f31---2745486199.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/ziwojaduwisaxugazipufopiv.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 26448 bytes
SHA-256: 121779dddef17856b283cd4e06d74f6315767bd3e8ce6b285536c937247f55bb
font_01_sfnt_off00012444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12444 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off00012c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3B 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off0001422a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422A 11424 bytes
SHA-256: 3d3538a518194857d798b979e6ca1eff38439d97d51e250d8d6fc60910140f28
font_04_sfnt_off00015c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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