Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b53bf0813aed791…

MALICIOUS

PDF

89.5 KB Created: 2021-08-11 10:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e24c9aea8dec0b5e4349a42808cd4a02 SHA-1: ced0787ae31277b1819085728eb59a75d49010d9 SHA-256: 3b53bf0813aed791d812c783fc11412f79d88d391ea1590175b211795403ab7b
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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.upperhousedev7.com/ckfinder/userfiles/files/23362617031.pdf In PDF document text
    • https://goodline.by/userfiles/file/88057079558.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a82ae745291---33798006528.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/belekevadaborun.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/47805542406.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/muwowudez.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/mgg8uvkpcp3cklsrvppomgk48m/jewisadenojox.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64d9ed2490---50241768083.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bd86040111c---zexurorimezoko.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5176f130bbc34a3bbba473e0e30deddb/dekogaredimufowojo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c511bf2cb0---26947588432.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8d24ba470---69254339313.pdfIn PDF document text
    • https://pmms-online.com/assets/file/56354971845.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/12be9c10e078c78f08f992ff06e2c484/morenexupulubuxini.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c52e7d9ba---9852813287.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607935dd8cd92---xufimubesibepedosibasujum.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/83075047805.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/86648466553.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/95066959302.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/3d4ce83964d75940a8959756ccc6c181/75948478696.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210719_034813.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/pulafuw.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c6216716c9e3a86e4d54f53876f3294d/96106075586.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609826d8c4e3c---timawegotow.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/balewixeji.pdfIn PDF document text
    • https://tsegypt.com/file/sotosajujemexopivez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+variable+speed+pool+pump+2018PDF 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_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 17604 bytes
SHA-256: 35c0b4d2aff34a4e7282c8d8b5cc35b816c23342bb0f43ce55c61ad67a413ee2
font_01_sfnt_off00012580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 11308 bytes
SHA-256: 3f85422cad44330e67cc108f3d5e19cbe7576e7e10f7fce7ef7e44c61c189f4c
font_02_sfnt_off00013ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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