Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f28cbcf7b8efeef…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 08:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a9c56ba02b316767c5d2cf552bbfc153 SHA-1: 388b9e41dc463f657a2e3bc625fba112f3495e01 SHA-256: 8f28cbcf7b8efeef039a8b11d9064ce1d36e5f2e4f43201fd969d0b7eb9712d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=exercising+at+home+pdf PDF link annotation
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/12964598014e28d411b445690cbac5ac/lumomed.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e36f90e9c---lavebegimuxopu.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/gobovadewana.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gilegoratagak.pdfIn PDF document text
    • http://garderoba.sk/images/_file/93794821353.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160871fd67b65c---dorekodok.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea8ee67457---99724534647.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/luxuvinitolokaxemozebixu.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/58432050138.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/dotazawegifikon.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/xonajodi.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/61414747055.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d45f8dd6da4---jowubujurewi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2073276f99898c85cd9e0abfceeb87bb/dubej.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608394ee335be---30689271815.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/210c0068e55dfe2e4c7fd83d10ae713f/turev.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/xavejuralogelapajazenuf.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/2780545293.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7bc6c0b7e---65016995070.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7597905dd6c6377f6d1c5aaa4fc5c463/75484317023.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/41869576754.pdfIn PDF document text
    • http://rainesclassof1980.com/clients/3/31/314d3ac3c31ee16cfc8f78d457af0ebc/File/futib.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1610fb8332b1ba---94155322691.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/gejogevagopisisukifixunam.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_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 11104 bytes
SHA-256: a3c310e1ca2939c31992e97df93f7826e774aff9ef4472c5500f670241b26186
font_01_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 17612 bytes
SHA-256: 921c9fe1a337e5e198aff67e899a80b7f477292e0b4cbdbe835f783b34179e51
font_02_sfnt_off00011f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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