Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd5c4b385099bf7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 20:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67d6411cfe726b5b1947a58dc0d01ca0 SHA-1: 9419218b42f71b848ff86c1354a3e34eaedd736f SHA-256: fcd5c4b385099bf73025491161d8198e7ed51ac839313ed0009a4dfa9010e5be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b5b7d2e74---30164611459.pdf In PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/gatita.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/dajexapotabojede.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb5f021858---60804955105.pdfIn PDF document text
    • http://health-bridge.in/upload/file/zekozebak.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/vexowi.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/reletexenipozuzofezo.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/2413056.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/71943190861.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/kokotorirokufurikonu.pdfIn PDF document text
    • http://gtshotel.it/images/file/32417702506.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/zokuzan.pdfIn PDF document text
    • http://manu-transport.com/documents/file/77505013256.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/12097575792.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613714aae5092---58191490611.pdfIn PDF document text
    • https://bursac.net/userfiles/file/bosivumumipojat.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/5420603308.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/8p5vjafndmdopi5dkfvps70t7s/74808268919.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/dumub.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/64663471473.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134065b05f7e---zefasararav.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/64120804365.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/30162943239.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/q2r6udona48t6vjeu62gk06nr4/44821236417.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/50937465972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=play+theories+in+early+childhood+educationPDF 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_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 10680 bytes
SHA-256: 46f334bfd7c148e5d6f108e0b0e4620b3ff2ccb2f7a1cd27375979fe71c175a6
font_01_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001121d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121D 17544 bytes
SHA-256: 37ff11448987d8bdb255caa15be1b6980925df325ce239e5b880b10c79360437

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