Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d337913787830c6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 00:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31301a3374b3df8264dd0353e65fdb2a SHA-1: a741cc89a6126155ad1ae51b1c7ab8682ec9b51b SHA-256: 2d337913787830c683134b968786387138ae732ade457af3ed18240a3d2e5767
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crewmak.ru/uplcv?utm_term=oodles+of+oodles PDF link annotation
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/zafujijawugup.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a304bd8cc27---nedokumufos.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ik0du68g9blqgfd9r7g4lganpe/13485304034.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/mekazoxiram.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16087c50ee4abf---90491765647.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210504005010.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c2834644018---kadudegefuwufufanu.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xijemipus.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/fowimuk.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16082e8275d316---68534574605.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/19803862950.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e0765510---31256512937.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/32751623631.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e206f8572a---gapopo.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/46127973892.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/rexuposinufanubujapox.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/xivadavukivanoreterabo.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b35c1274c550e2d3b18f4c1d99406785/64753792908.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a47efc1feabcc3123311496c276fe004/vodaji.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/24913932066.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/588fef2fd8c0e88baf524f48a8c3702f/12422802463.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/78348689600.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/43968014724.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a9f81d9ebd---lajolawanuvu.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/segimojojonavapo.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_off0000d1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 9816 bytes
SHA-256: 91d8688966d537bcbdb5ddd3026129fffb6875b66af193bc92a02d20df2f4822
font_02_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 23572 bytes
SHA-256: e1a0d0dbcc2e51e73d573bfe4b7e65c1827ae9b143021d8367f3f7ab2651b88b

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