Malicious PDF — malware analysis report

Static analysis result for SHA-256 b663ce14ef1aeff0…

MALICIOUS

PDF

91.6 KB Created: 2021-09-02 05:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7494856e872e7c1446df1d7a736101e6 SHA-1: 71af93c3a0dc169b0dace8e9f08f9d5f0a2c0974 SHA-256: b663ce14ef1aeff08076d85c8ba41fd3663212d117b1487ec6a62818929158e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate effort to create a network of links for SEO manipulation or to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/7g782a801p93l9pcdakghm6ll2/1210539263.pdf In PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/i1vuupu8a34iluu7887hdj8mon/13821168892.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b958d7df0fe---rawusotobefaxesuze.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d6949a05c4e695e646a407950c7b27d4/61806206153.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/75777238689.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e3ee34e2dd---xizorolalegimisejafebirof.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160717e92ef544---zojudomixer.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099824285178---sijosesalukusuwituliwimaf.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/78102911164.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/nimojowajila.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/de81a4070a4366a6ad74cf2684647178/vuxamirigafod.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/53291390667.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/favomivizubugajegudud.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///62110917978.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/55192410802.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/xepawamoxu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c878c27b3289d6ff72109d290540ae4f/rapot.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d3fe06feb7bbbee64feebcc90d9ff3b6/55038271409.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/mukuxuvipefogaluz.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219d8e5ee0c---38788663422.pdfIn PDF document text
    • http://vswet.ru/f/81136107369.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/tasujesiwajomiduwar.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/731962288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=general+confession+prayerPDF 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_off00010351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10351 10528 bytes
SHA-256: 579b66842dd1cc3251cfdb65134e163194ca54b995009c0505322f1a7e9667cd
font_01_sfnt_off00011b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6A 17500 bytes
SHA-256: f70a9ba99dee75ca1f0024e0135f0c2f06ec47ba9c1074e697c4962ef080cc60
font_02_sfnt_off0001489b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1