Malicious PDF — malware analysis report

Static analysis result for SHA-256 567f514f51b0a28d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 21:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d9a50243579a8619799b03cf59826cf SHA-1: 0eec1794a783d6110e40a83b1096f4a43048ca4e SHA-256: 567f514f51b0a28dab611113aae50fe928c7509b557fc38da2dcb79d9a3045c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the nature of the links and the heuristic firings point towards an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=naruto+series+watch+order PDF link annotation
    • http://grandinhr.eu/images/user/file/ravibuk.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/85605150600.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5e182b42d---65899938711.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/pulotobituparenuxokifojav.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/fibeferodobij.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16121b547c82ca---jakomerimenipap.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/reseduj.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/om3bdl3fnsurr4ukbirla7b584/zixoruzep.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/tuvidabegomomolabixi.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5f15e8ae735f0041e89d7b3bacf7d2a1/mitok.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/xanadixofovawi.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210531032653.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/88635812382.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/4251423174.pdfIn PDF document text
    • https://wecareprogram.org/images/file/zevurezavajepew.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/tusukegugojebonejumufox.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085087f9d9f7---wajupudezes.pdfIn PDF document text
    • http://thongthien.vn/upload/files/ralavenaxofokuxakulez.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f024812a4efc2a594a4027de82c22d29/kitegudikitugewoz.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/zifevefomakujixogek.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/detukevavizuxawepejodoka.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/dibunokewub.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/rimimodivanosuxere.pdfIn PDF document text
    • 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_off0000def9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 10480 bytes
SHA-256: b30987646adb7d2e146b055cf31167756ab39cbef9e38ddea9cb92357cc91c38
font_01_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 18296 bytes
SHA-256: 70a38af151dc6a0e143174b27abcd2208850dbbaaa6700607c9c18ebb81bc6f7
font_02_sfnt_off0001261f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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