Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f66c3c1ce938e7…

MALICIOUS

PDF

90.4 KB Created: 2021-07-18 15:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07d9f80324fd5a7d6c6701974c496f08 SHA-1: e33f813f87535aac50cb907b5c532485afdd4e83 SHA-256: e4f66c3c1ce938e7098d893f2166c640716dfeda8078b1e3c0810fff619bc7b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders. The document body is unreadable, but the heuristics strongly indicate a malicious intent to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/0nmetu01sm47qtmbvf1nfh7pp6/lunojixoxototisoxi.pdf In PDF document text
    • http://nexxosrealty.com/userfiles/files/6873119390.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105152227456550.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/q7pkf4935sg9l7c8pfctjtbhp3/7341763258.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/61929285aff47816eb18c909ef01b5ca/35297344012.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/83074187971.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6b779f3c4---51716216303.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f311c156ebe---gomuwuzazoluvajux.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1e5baaed061b3224e12d68ecde097882/80317929617.pdfIn PDF document text
    • http://distributoram.com/files/file/72291220690.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/37934091318.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210716122317.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/scstjeus7i79thlu77uogpu3nl/pofum.pdfIn PDF document text
    • http://edelstar-mos.ru/files/nadokalolagaz.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/37221077967.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/wapevonewobulazowifubajar.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/nixusute.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc3d7a289---36459232035.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f6d252fea---jagotolapebej.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a607df0d500---wezudukinimu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160eda88bd99c5---bizesubenukinenax.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb83ee97c29---sigatetuzase.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210715224921.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ebf2450a3---wejajumik.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f24b0e4b066---getewisuvobete.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6bf2bc74a---55691404024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=double+crucible+method+for+fiber+fabricationPDF 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_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 10816 bytes
SHA-256: 25adff2f488315ce09fa9ee60eeac150a0c13f6d7bdff70e74942885213ee912
font_01_sfnt_off00011603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 17080 bytes
SHA-256: e3cf0b43993c5742877c0715dff5a45d625d75fae3899f1ac06a1896bc58d78f
font_02_sfnt_off00014214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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