Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0ffe020282b947…

MALICIOUS

PDF

96.5 KB Created: 2021-06-30 00:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2818924f69e8c07047e8f4bbc25a4228 SHA-1: 408a9af49e0cdd706d23a66e489eb4e8f057cf00 SHA-256: 4d0ffe020282b947d225de03502498bc3661592a241de35713aaeea26cd0c6a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://ketchas.ru/uplcv?utm_term=compatibility+without+birth+time
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cb93f3cd2---93782486706.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/k5ljl6bt5285lkef9mi72dmcca/jemugijivi.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/bt184nctt08pm4bgo976440fqd/nowusovazom.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d912f0485cd---54143499263.pdf
    • http://greece-ex.com/images/blog//file/18005513773.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/92499860802.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0294d26ec7---ligulitegolagedufome.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705ec364d22---72246777728.pdf
    • http://radio6deenero.com/uploaded/files/xajirelesopuranelun.pdf
    • https://tramtron.vn/uploads/files/files/dijezakupimim.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/8dc0bfb7ee2e207bf77cbd529a895c8b/duvakuxiveper.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160763d22114a0---mafoxumulugoretogamoj.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebac71de8a---fomebozikopesifavezi.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e17ecf564---42773823112.pdf
    • http://homeopathyhongkong.org/files/2593372104.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/8b4e983f4dffbd7eea309b97cfdd12b4/50725912266.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608074985bc4f---leratonaref.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/4d248722de0d00d7fee9dd25a686f382/27697776449.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1621756280244.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160719d83d002c---51799459450.pdf
    • http://omonetach.pl/foto/ilustracje/file/dapudivaripezomagetu.pdf
    • https://arerp.kr/data/file///41200598035.pdf
    • http://alliusie.com/userfiles/file/42872825566.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b089db25d8d---zilaxemozov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001154d.bin
e2c33b8bb23500e6a94de43792327137b069181713a5d453a8c0806c9238dbbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1154D 17448 bytes
font_01_sfnt_off000142d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x142D1 16792 bytes
font_02_sfnt_off00015ae8.bin
0bd57af38197181281e16b2d344feb02c0b54bdbfdf22c02625ae9f2f638c6c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE8 10716 bytes