Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b538667e699b69e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 01:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68b6d3cc292e6120bb44f48aeec47ad3 SHA-1: 8a1189a13c95c6a724cf03c749758afbc64c51be SHA-256: 6b538667e699b69e7b1062b8c61d4504ac97217aa83a18ac2c282f49b082f0fa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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=sambhaji+raje+history+in+marathi+pdf PDF link annotation
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e8cd3f7ca---19549014922.pdfIn PDF document text
    • https://phr4u.com/files/27017403186.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928630169de---45743632800.pdfIn PDF document text
    • http://allasclub.com/campannas/file/8739435018.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/purexiwegejanufid.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/kewowobudozupolabij.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad861231c34---67118497975.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/bedodufejabatabemegaboraw.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210813034956_rel7gn.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfed857ab4f---neruke.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fb5e9151f1f5ac9df3a8c63f09fff0e1/kubesupopin.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/45352583726.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/piludevaxemofofuto.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e3dd4ceb56---50564084608.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/3e2d453c20128404ecd774efb5be750b/97190197939.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/lovosowow.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/96444547954.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/37775549951.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2hnhuufsdgaijjhuvifre4g490/47976130423.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ecb6bc219dfebcb25ab7bf520ebbfdf9/sotarikazuvisigedibutok.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3ea0adcd91---sapopiparo.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/60751670098.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/30557162527.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127df9a1ae38---fizilulusaxunedat.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/pfp36je4vdapkcdg3o9cbi4af7/48196753276.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/nurolosaretuwax.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/9992e32448adecdeddc3f1ef1efa36a1/47096472641.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_off0000d242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD242 20412 bytes
SHA-256: 782c3f84b6f08e3e488b7aa37488b313343818df425220ed17dd09984d51c839
font_01_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 11176 bytes
SHA-256: 0fe0810fc5a5343df39a70705cf8eedc31a72f6d7d2391f4757e9a2532765b31
font_02_sfnt_off0001215e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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