Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d652df82a3f13d…

MALICIOUS

PDF

87.6 KB Created: 2021-07-01 16:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ea170a24ee9820be4a9fca6e9972a2ff SHA-1: 00975e086aa6c3d40316fe6bb484f00097edca3e SHA-256: 89d652df82a3f13d3a37e65353b1ca4a2445e417302a65dfb4af5effd38e361d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, possibly leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a95bd4d93f8---15474978610.pdf In PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/86622003249.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b1416beaf---divuvene.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e725215215---wuwigoxezageba.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/1ea6af35f57e87afc39e259f5dfe6fa2/gezuwanujegikafeb.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5917b9e24d---56931605305.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d09340117f---totedaxuwifolozamevaval.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/66038186345.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942ffbcafe9---77810037095.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd388f3fca---likakujid.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b7339d064---kuzunilagugejab.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160890f638da4f---nolorebelivar.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/70c2dc252cfbe7af6103052e0bdf317e/37643650089.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/607eabd73dab17091ec8cfa90e57fe96/95881930247.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/648d5dacd429a81d97718e175a050d71/rigitovuxonefimabesis.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/stktll77bsnmebsjlui3ug622d/90144563116.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/3cb3f65c28da5271b4617cc5d97e4091/dagexinanomodaxoxip.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d539d2cc0db9dd8ed4722d55e86ca32e/rebaseka.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7f6b3158---49954169401.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c0362d250bd---94625094711.pdfIn PDF document text
    • http://apsons.eu/files/file/65168664120.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/86265747657.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/30988034087.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/lavizi.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/a0bf320e6ff9ebc63832d1c198a6223a/kelaxuguratogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+the+past+tense+of+layPDF 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_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 16928 bytes
SHA-256: c9bacd7d85023fd2209ac6b046c66a41d81eec6a80a1581cbddf3392d6ceab53
font_01_sfnt_off00011ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFC 10460 bytes
SHA-256: 8bb2cf645034a9bd7d41af47042e6603bf776bd7f0b073c873a6d5f60be2682d
font_02_sfnt_off000137b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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