Malicious PDF — malware analysis report

Static analysis result for SHA-256 51abc98b83987abc…

MALICIOUS

PDF

76.8 KB Created: 2021-09-21 06:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f957c28075a8046fea5684591155e56 SHA-1: f52db03edcda602984da480028d05090e28dca7f SHA-256: 51abc98b83987abceb54bf2fc35bbf7a82d49c4a32983fde5cfdd2adfedf11b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://archism.ru/uplcv?utm_term=tekken+3+full+game+download+for+android PDF link annotation
    • http://studiotecnicomartani.eu/userfiles/files/94943171963.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/6493061d5c405bff4b760703cd352ed5/bukowi.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/nozovojonegazojifufanaw.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/80623343799.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/fawugemejulesipumoritijav.pdfIn PDF document text
    • http://zl369.net/userfiles/file/vomofawon.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/26a70283e55fb3929b2481e27429c7cc/milak.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/zugelosiromoliroguzoj.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614902d02b28d---sadusedufaxutelu.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/jitiwomevisirixobiw.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/80712488499.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/67159512729.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210905011626.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/65107823672.pdfIn PDF document text
    • http://meditopthailand.com/file/luwojisin.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/25202562821.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/53196194940.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/15257182904.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/84978616926.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/44722775845.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/fomegadup.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CC 14976 bytes
SHA-256: 193780aed323d4343f200ed2ccd940292607c288ed08e4862737f08c44bf0e9b
font_01_sfnt_off0000d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 10844 bytes
SHA-256: 1a91c15477833685cbc32202a924a5e077fd08b95c080afe8e5dac92982e2cee
font_02_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 17472 bytes
SHA-256: cfbafb480152fdcc906a9be64ce67ccd64f6d9a408d2d4675346ca98cbe228f5
font_03_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1