Malicious PDF — malware analysis report

Static analysis result for SHA-256 662380832237c4a7…

MALICIOUS

PDF

91.1 KB Created: 2021-09-03 03:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 258ed307273296d717d6a8e5c2d108a6 SHA-1: 550ecf2b02e20f6c55e7aaa265a05495af5d59c4 SHA-256: 662380832237c4a7f2505214fa6f58cdfdb7481a7a24882efbdb6f35724a08a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The file also includes numerous external links, many pointing to compromised WordPress sites or potentially disposable hosting, suggesting an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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 https://pixel.bg/img/file/vujepesuzipiwelu.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dfca5f1ce---kekemax.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/66280138283.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/el2ib6vhf23o32g4q39om41m1u/fovegijadolorasuwexinem.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/n26c6pishckum9iidok3ij30s3/gipuluduwuzut.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/56145059116.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2e2f4fe2a---66467910122.pdfIn PDF document text
    • http://adice-area.com/pictures/files/memilokanonotudez.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/dirofumomixodasiposirewi.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/guxejusal.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gobelajovijogazemerele.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/27160888956.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/jiwokemitut.pdfIn PDF document text
    • https://ienter.bg/files/fudorelebopo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b0efced67---ziseminasuvegos.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/1673115121.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/96095063032.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823c0deba2b---jijebivago.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9347b2ef---6935201564.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/fiwemovalopiwuwaxifalig.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/fpdhkob7abdr7abhe2goe28mi3/26948521193.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a224bdca65---57145615290.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/85712447022.pdfIn PDF document text
    • https://dm288.com/slicice/file/97733221223.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/64293706414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=us+history+openstax+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_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 18392 bytes
SHA-256: d681277275f4ab29a2b9784854e3cbc274627e362ac647baf69b6d4174c07ead
font_02_sfnt_off0001459a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459A 10772 bytes
SHA-256: f576f35d2fbb5b49aaf715da696114a60a2410d954b4bec2d8fe0554f5f9270a

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