Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b61cfd45652ced…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 12:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30f24822c0dd4aad7694d4652fdb078e SHA-1: c62a15a69317c782cf47406dcb572b82b5f6c28c SHA-256: 75b61cfd45652cedd5b7f79d9cad5627d4375103f0422ff26905a8482a09e914
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress 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 presence of multiple external URIs and a link farm heuristic points towards an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=how+to+download+carrom+pool+mod+apk PDF link annotation
    • http://santabruna.cl/upload/file/wajazekafejafowagoxugezex.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/50085925299.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/nutefepe.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/lawif.pdfIn PDF document text
    • http://congtyvima.com/images/Download/bowowujotimu.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/tolonataduvef.pdfIn PDF document text
    • https://invision.buzyhub.com/files/wiwutemobidomarukobavazap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f49ab2fd---xapujemuzibev.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/oj5j3glaervc2uln222leka3g5/98071060062.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/9320534272.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/29295189610.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/semofagaxadekepagikugeko.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/muwunutegufobel.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411eaebf76f---fofemetipuvoxi.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/fujetolan.pdfIn PDF document text
    • http://cocoal.com/uploads/file/87894174715.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/topabosepebuwanar.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/296745861.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/gopoxomenabufoj.pdfIn PDF document text
    • http://techbis.pl/files/file/72476668953.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/38866002836.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/28174249832.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16142176e63a60---gotevudonotudabob.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/93180427810.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_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 10452 bytes
SHA-256: f2c7494bf5cd43b6be491aa3ae7caefb6cfdbf2994f1f0c3a6501fc6665e858b
font_02_sfnt_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 17852 bytes
SHA-256: 37bc6433dcbfd0e073630546a2c4dd20e5283c8256eccc215ef47d9c3099d109

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