Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e73d10e5f98d5f0…

MALICIOUS

PDF

73.7 KB Created: 2021-09-04 01:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f50deb43b7fa877fb8f4c76ea859c2f2 SHA-1: 0e87bc1fc647142ce355681ccce73813151d489a SHA-256: 2e73d10e5f98d5f0fbcc9d3add19a5e9054d10a76fb9bb0439df55a2738cc1b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Numerous heuristics indicate it functions as a link farm, directing users to various external PDF files hosted on potentially compromised or disposable domains. The embedded URLs suggest a phishing or malware distribution attempt, likely leveraging the document's content to trick the user into clicking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=c+programming+beginner+to+expert+pdf PDF link annotation
    • http://fiumevivo.it/userfiles/files/34079610346.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/65304961408.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/zinitunamizudugekelo.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/62227743490.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/72337219421.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/mafirilupuzafetolavo.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/vudabifelujovugesuja.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/xawujotagikezamug.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/wonoxerolakegog.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a65b9867b73---wamuguwalibusimufodefana.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/jemuwezinipebuzugilezem.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f95b76601---56663794913.pdfIn PDF document text
    • http://screen.by/images/file/zalenezeri.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16089c3396c40c---89975522928.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/83809418447.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090406435373499.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/4893106317.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zesifafovomivurosokaperuf.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160887efe3e72d---lasatewuvedakovurinuza.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/45994477156.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/nabubivogibapodezikowumi.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef8a46cbd4---suzitekasaxurejafedazi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c44e2eb5064---7748582815.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093e5b804ccb---kuweripelabutirojekuxane.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_off0000bd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 16360 bytes
SHA-256: 6ee8321149c86a1df36a75a68dbf3675c70af71993acf3e584c0d750dc95a751
font_02_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 10900 bytes
SHA-256: d7bb95d2c7508143f8ecf4d47a104d03f9119b4227e33a91c7646f70c7676041

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