Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fc81de10664e38…

MALICIOUS

PDF

70.2 KB Created: 2021-09-06 23:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd930590047ebce40e7c8d00b64b8d20 SHA-1: 50b82929e092862772a94f0c648d9b71dacb6bb5 SHA-256: e9fc81de10664e387ec322139fa66e8b3e97310d02dae0d760f040f7c135ebdd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The heuristics indicate it's an image-based lure, typical of phishing campaigns, containing numerous links to potentially compromised websites. The primary attack pattern involves directing users to external URLs, likely to download further malicious content or conduct credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://chcial.ru/uplcv?utm_term=aviation+and+airport+security+pdf PDF link annotation
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e9f46e48bc89f400b2b5a2942c6f3444/13863362858.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/29846966666.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745325bab82---82997947540.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/mubevavevuniki.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8cf9407167ef5d6b3605e053b0b0ac4a/vuxefozugilasebi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607014e0a2acc---xadajiro.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b092b15d7f7---73843886218.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c53a59938---3998174169.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/govuji.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607511b322ff7---40467896817.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/50439900074.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/linikoro.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/97152719564.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/2490275535.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160776e5bea636---zikabaxalu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea43e02eb---90483434746.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/60769149175.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/tpp7sfvt0e36gmlesefabluav7/10343084286.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210703081004_322964997.pdfIn PDF document text
    • http://findusafranchise.com/files/files/11007072339.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/47514497766.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6c03e340f---4225982825.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081f9f975485---tefewozipesomisajosatu.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/zuzaje.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/65940700593.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ed793d4aa---71215668503.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160946ebb27cb8---62734160037.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_off0000b6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECA 10828 bytes
SHA-256: 3b8757dca046683c956ec4e2af8f8033a082c1e4f431c724c41cbfa72c956ee5
font_02_sfnt_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 14112 bytes
SHA-256: a05f8b53bb12e47b311d95cf6ecce50f2f3efe610fa5168f185736ea5e5affa4

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