Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab197834e8c2ee97…

MALICIOUS

PDF

125.3 KB Created: 2021-10-07 03:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 054868bd229cede5688e67e258472c9b SHA-1: bced841a88c700d65cceabdf6cf5a59b2be9766a SHA-256: ab197834e8c2ee97d7477cfbd217ebe67a81081dcd9d71e281e129325b468f1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to various domains, likely intended to redirect users to phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=the+fountainhead+novel+pdf+free+download PDF link annotation
    • https://planningpvedh.nl/ckfinder/userfiles/files/97798880239.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/tiwilof.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/vomesew.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/11101274942.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/00ja78lvsd1i2acgomspkqn33j/51680286986.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/tetikebulob.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38653109243.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/603rdpkj38fgjvaug4ksgi7u5i/96464679629.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/70008245204.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/qope0i0c95artatln7dp7g894c/20611627198.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/kemavafovefaten.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/latedurutufemikibuz.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/xibimedarinaje.pdfIn PDF document text
    • http://dongphat.net/upload/files/rivegu.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210914042934.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/mobidajututaxaseledowilid.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148c2ae77d11---fipafel.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/2259468410.pdfIn PDF document text
    • http://tzsunup.com/upload/kumutuwajumikonefore.pdfIn PDF document text
    • http://battle.bpv.su/content/files/files/33484199202.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/55218528025.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/60046976737.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f97fee7b4ff8eeecc171b4d0fdb3a145/54264419837.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202192135368177.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210913_31C31877B0C7FD32.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_off00017e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19655 10644 bytes
SHA-256: 5125b256f8eb8ea45d78a13af9c85359e30230a8be37954f392e45a74e839022
font_02_sfnt_off0001aea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEA6 20908 bytes
SHA-256: 58b32cc06c667f65fdf02d1522fba3f8eca66f3093be6121652066dd439f19b2

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