Malicious PDF — malware analysis report

Static analysis result for SHA-256 e775adc03b8e90be…

MALICIOUS

PDF

86.6 KB Created: 2021-09-03 21:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3f465fb2897d990bd1a19c795a80bdd SHA-1: f1c991be222f682f88f074cccf35a14352de0aac SHA-256: e775adc03b8e90be0a4efedae03fa6ac31d169dcfea3d76b82b7d8aade5974e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites and disposable hosting, likely to distribute phishing content or manipulate search engine results. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://csc-021.com/userfiles/file/20210618134627_czf52r.pdf In PDF document text
    • http://iaestedresden.de/userfiles/file/lerukuwimudajidulesege.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/53633223969.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/volevowowogowotido.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/gomuvi.pdfIn PDF document text
    • http://sinostandards.net/upload/files/70205939162.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/lumukafusivoxosex.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/11e3f3b48b29e7119dc11502408c37da/61946650217.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926b003aa5a---bosesusuruwavexit.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/zabik.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f87c4e62626---78148396377.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076751792432---piwanesebilusab.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210628032616110.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/30605206374.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/7066667369.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a137c783347---70120540571.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/97185337241.pdfIn PDF document text
    • http://3asoft.vn/img/files/81801437612.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/809147cee5c4b1a86652248e6527182e/4497255651.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5ed7fc5905b00b8ae8ea2988c274cd71/sisuzekuwe.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/ramujojajemo.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/fimisuzinipo.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/pufuzilupuxomivetugi.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/a1fbe5b3c1a50b289bcc1e2a841b3ec0/pumarovivalupozeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=back+pain+exercises+pdf+nhsPDF 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_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 16408 bytes
SHA-256: 8eeb524cb1900dfc4950124748b88ed0e1470943755ca04cf74129701e7f68f2
font_02_sfnt_off00013431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13431 10700 bytes
SHA-256: 48afd9d9401d1a08fc4b255ac95474cfd7674f140995241032252f54272b48d6

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