Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc91dbced199aba…

MALICIOUS

PDF

76.3 KB Created: 2021-09-12 17:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80ba36cb0d6a38f0cfa988e4f47c8e33 SHA-1: 5c9fac380f9a89d52b249429103e31e6a576be84 SHA-256: bdc91dbced199aba5e35f9f021807ad4db6b237d29d3d008acf5bc97aedd0c52
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://allytemp.ru/uplcv?utm_term=play+store+for+laptop+windows+7 PDF link annotation
    • http://uk-finansist.ru/userfiles/file/47911293720.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/nibajelexupu.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/28290896480.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/nezavulaverozexu.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/voguwijegejidaruvujinix.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/vurolijiwosozeram.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/81tersj1dhnnhbvsdi6unjfhr7/wuzisakexorinonebokoke.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/rofetelisolafen.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/wumizigo.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/90709227098.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139387961d98---24591246571.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613100fa6b731---36894389489.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/69913618795.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/bamopazik.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/79991755921.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/28202177753.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/20381658850.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613565c67fd75---lasowafusotolim.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/83066892907.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/14879721432.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/83041579433.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/887611880.pdfIn PDF document text
    • http://orthopediedelft.eu/files/39790771439.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/54329513086.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210902213102_si3uz9.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_off0000c6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 16988 bytes
SHA-256: e301eaac3b452284b82e35635e3544e7fb0806305b1a3d52573076a56f00a288
font_02_sfnt_off00010b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B03 10744 bytes
SHA-256: 50eee08a3c3736e8497d84bad02eb87da23786d829741a94ec349c21a5142f47

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