Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dea45adb4b60807…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 09:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc5dc3c2183270aa6b17dce011b301f6 SHA-1: ef5a908336e82a8c2251d23999071b854f50df1a SHA-256: 3dea45adb4b6080754e9ebebbca17a800a969168b19dd8f95af20cf53c4a7b64
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links likely serve as a lure to redirect users to phishing sites or download further malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://infrive.ru/uplcv?utm_term=open+rtf+file+android PDF link annotation
    • https://audreyheselmans.com/_files/file/gaxom.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/kitomalor.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/8k0509u8ov5f2fmkhhfh9hsv0o/35102835392.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bf63023a4---gidotiledapulemifo.pdfIn PDF document text
    • http://szwygs.com/upload/sarafimo.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/bepezozapiwojixu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b324849293a810b76fae6d2e234a2b85/84948884951.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/94980899466.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/todozusurojelupopubu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/920df6d3cd5fd0b4c9b9f4ae07b2ea3e/81940412452.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e63462b887b999922063973a880f28b0/64130984147.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/mupajibopekurejegaf.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/d6ghp8ginjj5v13isqletq63bd/mamavawexabenusex.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/2183697572.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/kewesifawasuwunawidure.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/gunivelapoxi.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/xupovogarudalolujerenen.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/mijudunikomifozabe.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/75002416830.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/16870871791.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210905_A3A0E21423CDC1D0.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/36372386645.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c91da5640---67151453334.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2vntgm3hnd2tbpbee4caev1b6/guvotaz.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138975cab820---59489845720.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/13261036060.pdfIn PDF document text
    • https://fishuntpesca.it/file/66311190929.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_off0000ce25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE25 17304 bytes
SHA-256: 72bf02a80b7ff8b06734e29b519033ba2bdcdcd536a57efd5b59d2eaf43ef9b1
font_01_sfnt_off0000fb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 10348 bytes
SHA-256: 049b65d68133eca296f76e75f62ec083f4baec6481a072b9cad786a6aa9b140b

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