Malicious PDF — malware analysis report

Static analysis result for SHA-256 b019254319050480…

MALICIOUS

PDF

73.9 KB Created: 2021-09-13 04:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb5c7476fb4a5021c951bb103f32210b SHA-1: 931f720b60b6d817b842f5e4197e784bfafb0425 SHA-256: b0192543190504806cccf385b00a7d62a91446108eba0570b582056eec14007c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users to external sites via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://cepatdaftargroup2.com/contents/files/dosebijobufak.pdf In PDF document text
    • http://murito.fr/ckfinder/userfiles/files/86354268621.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/dumibuzotafuduvukejo.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/47087475290.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/lames.pdfIn PDF document text
    • http://konberdbio.com/upload/files/77341288228.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/pozowo.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/r2suucsjf44bqo37bhspkg0r21/29009784445.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/86134215393.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1a46cb955---fexuxobej.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/49233046191.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/webomatodarapovatoritad.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/35952159575.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/zozilewe.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/69266501815.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/runakaluwad.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613c97f395e5b---87445208948.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/pujunovimumemigeluvapakut.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/16401822126.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/9c7be25cf924af3d720362dcf565b233/zoxebaguzetef.pdfIn PDF document text
    • https://trieurodata.ro/images/file/84245512918.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a907d9c214934c7699a79cb94b4233ac/97006415673.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132768fa6560---tebajowada.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/40725589137.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/fagamididudel.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/27090552205.pdfIn PDF document text
    • http://lecostationery.com/files/file/10958294862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=app+download+sites+for+androidPDF link annotation
    • 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_off0000be7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7F 16964 bytes
SHA-256: a5fcb5564812787b155b9b4f66fac1c3188fef6975b1e26cb628bf19cb4537c2
font_01_sfnt_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 10560 bytes
SHA-256: 050d1b2f90aa3949bc0df559f6769f3b5f1553130f379ae5df475ece2d67c1ce
font_02_sfnt_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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