Malicious PDF — malware analysis report

Static analysis result for SHA-256 687873641f91733e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 00:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7012a8ce61c38e3e9e033b71607f85e7 SHA-1: fce2e918750e73a56feba170f3fc3e25f920eed7 SHA-256: 687873641f91733e0d13b3f59381e6bb9f32dd6cb4793fedbb6c4d92b2a36c5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is a common technique for obfuscating malicious links or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.hz-kontejnery.cz/ckfinder/userfiles/files/93015384571.pdf In PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/zekevuzelekuwigo.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/sunugixazadusonajitexef.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/e6emp1iilm2le7fm7neansem4k/95649073854.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49bfc59811---sugunozawuzimato.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/64237806866.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/99847668330.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/f9c6c02e71786fff8da4bf6768bd4038/puzoriseruju.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/a8oda6nvo97hq2h8gs0a7fs7v9/bifotogizijavojadawex.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/40303295238.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/71308973768.pdfIn PDF document text
    • https://slotpt2.com/contents/files/34345285864.pdfIn PDF document text
    • https://emprenderem.cl/files/63655603497.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/xudenilomi.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/94301548239.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/faf23bdab386d0734a2a7eca9ffba4d1/zibilewipejudiz.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/falkmd7ofp73h3t5ivtndfrbgv/nexawejoritaguxapoju.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/20091941527.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/sozilup.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0dd129025e4e47c6981348b363744e0e/totumofobiramotin.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/70827038618.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7239197da---bawijesuwosopijare.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210828145107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=orientalismo+said+pdf+itaPDF 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_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 10684 bytes
SHA-256: d2876c1fad5ee06c8868308884f78c83a8d74ff2ca118cc1e675b270f66535a1
font_01_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 18828 bytes
SHA-256: 27e57c5d54605270c4064705061fb6591e5b2e20d03d424979d5604924acc8c0
font_02_sfnt_off00012b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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