Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1234cfd829a05c…

MALICIOUS

PDF

76.7 KB Created: 2021-08-15 19:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9236a728bb13c539e41875b994c2dc72 SHA-1: bb4f5cd2b84420fe511fc91804762962c31a1779 SHA-256: dd1234cfd829a05c8208b2bd0e1a742fe63fd472939b98492beecdd6abdf58b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links pointing to other PDF files, many hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/aikn77algi42g9t2gftmcivovq/11834226231.pdf In PDF document text
    • https://aawyx.com/sites/default/imageuser/file/22009404441.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/25992386128.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/nuzokezunojefifusuwatez.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/butusilokelijewi.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac6641a03b---42658926516.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/rufaginabijoroxuli.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/lakewoxukorobefidit.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d26246f7c---18258250995.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8kcherecca42g0ngeprm506hs1/24405942833.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/nerajado.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e1dce5f5---86396629859.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102a556ac81b---vutuzutiz.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ae5200a2---83179206211.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/13608756204.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/wezibisitixob.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/k5uc8el47d6kr4av3lkjdkrq01/xawalimupuduposevuwa.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/rimorakobivuzag.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/22788463154.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/botoditawiv.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/nuziruxesuxapepok.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/dhqiltq1v3sbmu2emg1ds63h8v/81094680266.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/28605347221.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37a9c2fbb8---5591797589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=arcs+and+angles+worksheet+pdfPDF 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_off0000caed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAED 15908 bytes
SHA-256: 680787b459a32760c2364b8dcc07c564939a6e9e977a7376b19ae87dbb05fe08
font_01_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 10964 bytes
SHA-256: 2a483068a4075b7f3ae7b52061fa549768aba2d563be4d0f111829bf1b8a85f3
font_02_sfnt_off00010d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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