Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9f654f0fc92325…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 23:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c945f1d2195fe1a632da4239052c7478 SHA-1: 3a6756726d14d2853fbf8ad70ee9a8a05942e4e4 SHA-256: fa9f654f0fc9232535b5ad06a90a3e7c9ab21685115b7327dad0de29175ed559
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=neumonia+por+aspiracion+en+ni%C3%B1os+pdf PDF link annotation
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e2697157d22315cd05a753968f664895/bugemotan.pdfIn PDF document text
    • http://coumert.com/images/file/28601249051.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2439ddf98---43957807230.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1629903921.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/ab09ca1cc8e7f80d6e2df2e01cdf001e/59473800135.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/31473015122.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf901d697b---75037733745.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/h3je51kvvtoqic2vra465irbgb/30402851363.pdfIn PDF document text
    • http://accountingworld.in/singhania/downloads/file/88467512920.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/94861470131.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/madupetazujupol.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/jawumu.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/33169391335.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/50262242643.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/r513g2lqvhjourslm96ekn0snv/17041295349.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/20054657668.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098295742cfd---zowujojutilexikexep.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d0a465f5b7b1cca3bc0460135bd32f4/tigazedunuvisu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ijj0mmuf6m8ima6jdfkvgrd6a1/pevedazi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd472bb2765---76636990511.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7ca3c6d02bb6cbb72fc270bdb698cb0b/96757008735.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/19230689353.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2069115005---vajurusasedu.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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 18028 bytes
SHA-256: d4140d7361bcaf8b458a44bb371b22c7110abfdf45e8f2b8aeb5cd140e063508
font_01_sfnt_off000104d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEC 10920 bytes
SHA-256: fe61fe77e277a157f16b5e1966fa60f5f3005a923550e7a1eddd5d876cae3e42

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