Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec74659bf9cdad28…

MALICIOUS

PDF

89.3 KB Created: 2021-07-07 01:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 57fb9c93cdeb7e01d43ed2d8c0648ffe SHA-1: 095fa59bc7d3dfebcaf4d70c6e339171e70d6b1c SHA-256: ec74659bf9cdad28e6e93e42d24c006aaa2d6e0d9fe09ee4cdde8edd3233200e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a spearphishing attachment, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://feng-shuiworld.com/userfiles/file/zirubonexeruzukogekeko.pdf In PDF document text
    • http://foto-klub.dk/userfiles/file/17242526157.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fa28a1d62---gigaxafilewub.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078104b07347---72523377002.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e105557d---gopomumibuxobifobajaneb.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/4d554d467f21676ed1b56c951dd334ed/xowere.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/mipexuzirawixagab.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee18bd6278---waxota.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd610e7c8ce---87184396784.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/82518230665.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b07c5d9453---48745965849.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/54529185221.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/tajesuzanakozagi.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210627231250_l58aj4.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/15782559485.pdfIn PDF document text
    • https://angkalaris.com/contents//files/84057429177.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a095ed690e9---gidizuvulasi.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/rowesototixaloxum.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/1cebus664qak3ugvo4scrgtm8i/46007171163.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/bb0de5c4bd170e537f55060516652bec/vekisoda.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/vajagupebipogodeket.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/depufukufura.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/m2gonk3725bem657iieee36t91/74284551763.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/zugavibavepel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pinoy+movie+site+free+to+watchPDF 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_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 16968 bytes
SHA-256: 2f2b2490766c31a4d86b9226af19d32d1433474926e14a3d13b71f6f04970942
font_01_sfnt_off0001255b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255B 10824 bytes
SHA-256: 63558b2759a5458de716fe0bc90fdfc64a58656268764d9a298ecb85ce6198a9
font_02_sfnt_off00013e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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