Malicious PDF — malware analysis report

Static analysis result for SHA-256 9145604554a24a15…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 18:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97c10d21e7a0478dba0fb35b9757102f SHA-1: cd5273e9d3adf0cb98219264cbe3da0831086830 SHA-256: 9145604554a24a15cbab8b12f7d9b1cb18ffb98648ada951f2f085bbb3e911e0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be redirecting users to potentially harmful content, leveraging a link farm strategy to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2abbe101e7---92614988115.pdf In PDF document text
    • http://diysmart.net/userfiles/file/satukevemed.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c289364648---wosositojirorudilunimiron.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/6046623260.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/9uubbqs2fmhf9sltfp96l1nvhg/tisonizenidiridiwipozes.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021082316545813.pdfIn PDF document text
    • http://rts-3.ru/upload/files/konular.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5caf348c2e---51812842201.pdfIn PDF document text
    • https://flyags.com/editorResources/file///weluxudate.pdfIn PDF document text
    • https://tcremich.lu/files/files/92077803093.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/33726895265.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/88945346602.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/lumar.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210704065819.pdfIn PDF document text
    • http://deforma.it/userfiles/files/ruxegemejemasanebukuxadaz.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8eb4a1f2f---volen.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/76262166420.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/58265462214.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/rirafogimepinuzuwidite.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210504061732.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/nokezomonemugero.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ddeb896f8---bafelaxizukegafi.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/37338422814.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/9891a1f53905e685cf5a5b831771606a/dejez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=story+settings+worksheet+ks1PDF 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_off0000d3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 18524 bytes
SHA-256: fb5a262cfbc5c2b11a36cd95d00618a3f966476010935d144a37ff61b7f31fa5
font_02_sfnt_off00011c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4C 10600 bytes
SHA-256: 911e03087ce6724a4641ab698a21d6d8259192899d96d25e71f9e8165b51e927

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