Malicious PDF — malware analysis report

Static analysis result for SHA-256 3728e5618978f975…

MALICIOUS

PDF

92.3 KB Created: 2021-07-31 06:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 088138b2cbcd1dc48c810b7172e8dece SHA-1: 78d11a3de0c883499350d3971d2f9a90f72cbd77 SHA-256: 3728e5618978f975f79706807507a74aa28b4a49647b3ae51b0a851296b2472d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links is the primary indicator of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://palcev.ru/userfiles/file/keruwetitizo.pdf In PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/bifamazamu.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1acd2290ed---savorekenugedokon.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8b5d58376---62850805639.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ee5f127e6---9808094947.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/6606557555.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ade775ac9e4---29278263797.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071c8ff1abaa---39555003700.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/bosiviwetidiropejebigave.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097b032905d4---dibotitorerogosugitadok.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080b2c7562ca---65211669460.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/32313254609.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/pawupababiwoledixivusup.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/rimopebivumixu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16104baab6dcdd---71922098656.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/leleranofuzavaxikulowaxu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c77ebf5cb---vokepojebewofujop.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/54a530872297da8e88a23d6c479f061b/telejodeli.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/18635056277.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d0663bd4ebc42aca1f5d1ad94be4587/fisufeniroxasilufo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ev1767moqp0ed57ttk417p55ma/tajutasi.pdfIn PDF document text
    • http://mid-europe-ex.com/31991399410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kannukulla+nikkira+en+kadhaliye+female+hd+video+song+download+1080pPDF 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_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 16924 bytes
SHA-256: 9e4643744874a84af2e064851331e8aa575e95d8673be5cfe7d42944ea69737f
font_01_sfnt_off00012ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14707 11676 bytes
SHA-256: f1dccadb51c7254e71a1fa4dc0c33978f30ed6b6d0a438d5a2d94ceac830904b

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