Malicious PDF — malware analysis report

Static analysis result for SHA-256 157994882f85bb76…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 02:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04e7fdfea4ece70469527fee889d06c5 SHA-1: 071fc15b17f061f5392f24646400e3fd84865255 SHA-256: 157994882f85bb7698da91b9fa4e6b1e49026cbfa5a7065723f5086dfe0ab3de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=buku+islam+dan+budaya+jawa+pdf PDF link annotation
    • https://chungangroup.com/uploads/files/202109051550425435.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a54789482---zijulopibosuzonoxawuvoro.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/jelinabuposiv.pdfIn PDF document text
    • http://timebymtm.com/upload/files/kipolekawovuwuzomupe.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/45974788784.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/reguwexibawuk.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/94647152242.pdfIn PDF document text
    • https://izr.fr/files/92506543368.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-21/20210821232904835175.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/27962754931.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fa1315603bc---dizuf.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/52130142905.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610895a0b8323---winezekumafuluji.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e69976ff7ab42cddbcfeb35d8db23609/88896258116.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160845f76438e6---43689065375.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/884bbcd092721cde58036200e8b7c138/12727499265.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/dewugux.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132872295b5e---sezotuzumigibabojebujatav.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/94934167894.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4264943e7---57539724697.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/11007259412.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/bavaxamigobuwor.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_off0000d979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 10924 bytes
SHA-256: 083792351bae7362a4c44657fe075d305399f5384f7f0b70e8351a9a71335582
font_02_sfnt_off00010aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 17324 bytes
SHA-256: a3da27adcac7a446b54ebc8e766e74cd311251197d021bab5ffc21e4ac76bbee

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