Malicious PDF — malware analysis report

Static analysis result for SHA-256 263db0bf522abcd3…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 08:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: abb01a2afbcd8bcdd83f24549beaba01 SHA-1: fee4a74e2fef6bcc58e8b4629f66b8233114917c SHA-256: 263db0bf522abcd38d274aa4317ef08c87a3f50edfb5fcd5d958cd85f9097181
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=meditations+metaphysiques+descartes+pdf PDF link annotation
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/249ef2859e8c4e87913ee79df607299b/fewusafekam.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/909461f1fd5f4bebd6effdce65107981/nexomuxuwe.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146afd2e2124---28249058090.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/462160292.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/xipelijatili.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/65327531558.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/sunok.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161410d8a00f84---pipalajitajuvi.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/piboperi.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/65610698001.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/saxeserosewakiji.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/pupagol.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/fotogamanopuzaxe.pdfIn PDF document text
    • http://halaljones.com/uploads/files/lusopinopove.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/fisirubituvoloruzina.pdfIn PDF document text
    • https://labelmarket.eu/data/file/disexesutenibevades.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161414d38a2ac4---1887111048.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/10394940263.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/dogodimu.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/36199311479.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d92b98e949---33781360705.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92733599719.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/jirugusurulalezubiraruz.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_off0000b028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB028 11192 bytes
SHA-256: 95b66c077cbd528b5d76beb5b76daf6022303a3cda91bfcf7e7d857061a8f276
font_01_sfnt_off0000c9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F3 16644 bytes
SHA-256: 170ba174e3c2a012b6c0286ed4570c181a3c66c303a2bf07abc07ee7741540ab
font_02_sfnt_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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