Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3a375ed7d55e02…

MALICIOUS

PDF

77.7 KB Created: 2021-09-05 04:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f95e53bd198218f52efa9b4b6759a03 SHA-1: a3305ee2d18c78bdc0880cfd6a06755baa747a34 SHA-256: bf3a375ed7d55e02429d6affc804015ddb0e5e0684c367bf20be6d8867600eea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links further supports this phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://garglob.ru/uplcv?utm_term=use+the+distributive+property+and+combine+like+terms+worksheet+answers PDF link annotation
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070b01f0f568---vinozado.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/disuvukoruv.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16096827976fa2---79537654779.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/fefusuvememafifu.pdfIn PDF document text
    • https://birudongker.com/contents//files/noxupojekaragolage.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/51162148078.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/gakagafokipevexixalor.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/93404313595.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076068416f68---luvofupugejenigo.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/jovirivonajamo.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160876c6305cdb---kobuka.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/12/file/20210612_100736_170.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ac8be43e79c5490a1b72eae2f99f1e35/wojuwivutusagufokafew.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/jogawa.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/6684033647.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/33813567579.pdfIn PDF document text
    • https://diphong.com/uploads/xamivamovofafapenazewi.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/22766405454.pdfIn PDF document text
    • http://jump360.co/upload/files/20210627042854.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126d5c443f62---tipeduxi.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b8e188aa5b---xejof.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nubodanujo.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/45855826637.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/rexuwuxipuvaruginojuzivob.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/55360297595.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_off0000c68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 17556 bytes
SHA-256: 906fb78f613d31282393b60365511907e71ec64b276410b18c58254dcec5b5b5
font_02_sfnt_off00010c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C32 11384 bytes
SHA-256: d1d3cfe3cdf50f7236602c0aae74ea4a5036cc9ec07bdb53e8889b277e063389

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