Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a430f5876ce24f…

MALICIOUS

PDF

107.4 KB Created: 2021-07-14 06:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d59eec0b0d6d2b16236f5bd663ad5a30 SHA-1: 74bdc3ed76681fdd2e5ae9dd419991de511de267 SHA-256: 05a430f5876ce24f9e693c229be97ce023d97050d20e73a85d2b3f2213809289
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/3e53ec011f4b062f30807d5afe1129a4/lomomo.pdf In PDF document text
    • https://ak-oroslavje.hr/files/46530869139.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ai5asn30ddonsvaahkdrjuckei/68062085124.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/828914e6e26bdc3ec3ec78ec9b39d9ca/fexitamu.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/jvioj2ip3oc6mgoik510d4feib/70715563541.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/o6rcdkrj18kg2n19hqj0q3ai75/ridujel.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210530_7B8A269827D4D9A9.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5df4186744636c0fe805ba5a2e6fb374/sekib.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///tevaganobisixotudenutez.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a39ab1cfd5---83705360120.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/sagixagelorebobajegu.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8541cfed56bfbd633e5fa683a45a9b2f/83407370730.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/54380311913.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/burizu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16075efd3ba03d---72968636065.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/28555828036.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca2612796---legidalo.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8cd5f11d---97839443139.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdfdd65401---55235892343.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe62149f71---bawowonoxerinuranud.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/q8b2anatf803bijph2n1votv30/95002232288.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c07c436e61---53645659607.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/4428881751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=redistribution+of+wealth+theoryPDF 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_off00014004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14004 17976 bytes
SHA-256: 812f4b437c9d8b58e8555b1117555e09d2fcc0e6720b8d582f07a815c4d44911
font_01_sfnt_off00016ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ECD 10936 bytes
SHA-256: cce391eaf3134f2b4a9d37bfa35b81ceb31750246343bfc9cb268af8f9204138
font_02_sfnt_off00018826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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