Malicious PDF — malware analysis report

Static analysis result for SHA-256 98295111ed1f1136…

MALICIOUS

PDF

70.1 KB Created: 2021-09-14 13:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0bf0fd0dd712a186a91795d3219e1842 SHA-1: 5aea7028855a766bacbc2ba5b9b6ac1c3c266a3b SHA-256: 98295111ed1f1136ce749c86bcff0f825776ee3fc8d9a5b7a0d8ab831769f1f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of 'utm_term=download excel for ipad free' in one URL indicates a lure for potentially unwanted software or phishing. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=download+excel+for+ipad+free PDF link annotation
    • http://pxmonastery.org/CKEdit/upload/files/62382188561.pdfIn PDF document text
    • http://93564497.com/userfiles/faxeneruwibemexa.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/13715259919.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/s3sk5d0qith3sq5f9diqj4pvas/50049871009.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/499185aa9a9cef4ee01bed4fe4de4455/vokada.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/debimavato.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/47349007754.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7e720c46---63610764150.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/janubodepak.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/32866801052.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/taneraduxuj.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/51675850552.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m8jpvop74f785i1ohk4jr9v8j3/togumepugekitokijoletikad.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/gufixagitexega.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-2/20210902123345175007.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/50679224708.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fd04efb79---66322570103.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/43475688784.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/96099415073.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210906085022.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/51442826150.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210914_171851_154.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_off0000b22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3C 15964 bytes
SHA-256: a5e6228129f15b6b1ee3252958aae76c9bc75a828099fc9cf376851a0667e838
font_02_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 10536 bytes
SHA-256: a036bc8ce3f5fc8173dfe3a35240f45298adf40b669eee4d171254830f43f5bc