Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b47f3e893f29ff…

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 08:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3d5f8fd05f7761ddfc9a6d1feea1178e SHA-1: 7f194cca941a2616913acafdd8fc694c2eed60d4 SHA-256: 87b47f3e893f29ff458ca0dd6d9eaabeda2641aeea5b9bcc9970458656a2c156
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the heuristic firings and URL patterns point towards a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ok-poland.com/userfiles/file/gumoxelipazefewodexavu.pdf In PDF document text
    • https://ferdavagnar.is/images/fck/file/koxutawuxalimexutulafika.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/munumafotakinasukegem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced28a5bc29---24210448921.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/kuguvinujelig.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/bubakanawezasijulukoxovar.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/11844332656.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a10a446fcfa---24348614370.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/39934495811.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/jekavevizixogeponagipos.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/suxalo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/99p2t76it7s18cqnqcttv8jo5d/37274554857.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c4c349eb7d335e1259771414f1d95463/84372239357.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/fisudosejosadudodu.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/a52a9406f26e0c39fc46cf64e4da25c0/wokimifolajor.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607611e8739ad---96227271454.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/7322081542.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/icqiuhsbc3ho33jh1gqfg8u8oo/muziwisopomi.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/59769537965.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608162d4d01f3---nujodugenozuru.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/21585262528.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/86807782294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=student+attendance+register+pdfPDF 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_off0000cc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6A 17772 bytes
SHA-256: af47a2c15d30ec3725f8ced562bc1e17dcd0637786459383d8f07820c83f6bbc
font_01_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 10804 bytes
SHA-256: 7e2bf41c0ad57eae91331c8a202ff9f76feb4fe2c54102ae82cbdbcec700f50e
font_02_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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