Malicious PDF — malware analysis report

Static analysis result for SHA-256 3302ad830f8bfb51…

MALICIOUS

PDF

97.7 KB Created: 2021-08-10 19:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9d85867fd7ccf9f0241f4fabfac854f SHA-1: 4db460f69ff2a6dec6066d554902c381e2660467 SHA-256: 3302ad830f8bfb5111e04f390dbe13188bff3ab90cc6e07eb17b04fd82f90c6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest a phishing or content-luring attack pattern, likely intended to lead users to malicious payloads or further phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://nomylo.ru/uplcv?utm_term=good+morning+quotes+for+friends+in+marathi PDF link annotation
    • http://carrozzeriardue.it/userfiles/files/91073809851.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb7331f79---88889336666.pdfIn PDF document text
    • https://airshow-bg.com/file/wuzusofutatosaragubiduk.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/15f63d199e864405001400e8b8897eb0/budubizamajusupimupa.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724eb623cd4---32601188315.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/39784661343.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/tokujesifesabewabikis.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16076c4eca040a---bizimoxaxenuges.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6d10f09a---tirarajegeguxazekava.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210514151234178.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ed8be1e6a---dufebefome.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/denakaditesumedorovamefod.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51833b202---ziwofofeguvalotejovo.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/21325902626.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/fc32aa1aa2b0f272e57ede2a49038bb7/wodozozazinamuxawenoful.pdfIn PDF document text
    • http://ccsl.asia/files/laluw.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/tazozijegijokudozef.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/p031d418utvvg6sca13qvmktbd/52063729027.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7a7901fac---tofexojewesufusew.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/48965498d74da747d434c7a476414ddd/gifowe.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/21587484473.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9e6404e86a002e016c167a4e6158d67f/20746501351.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/38rvanqdth9o9u0e2kpr64fg24/48607388328.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off00011a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A54 11040 bytes
SHA-256: 84a81275513b62a5e682c51cc10334219c05acb95e94d17fd7144a40de0ea80f
font_02_sfnt_off00013359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6B 16556 bytes
SHA-256: c75d9a3cf2e401410e4b9fb9271ae454a0d6e5b49746cacdf0765da99494a754

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