Malicious PDF — malware analysis report

Static analysis result for SHA-256 864a452f58af9ad0…

MALICIOUS

PDF

93.9 KB Created: 2021-07-12 17:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 52f4007bac9eb5592ab9adb208c56360 SHA-1: f85b6381a4eca7441eb2a22681ce73f375ce0aba SHA-256: 864a452f58af9ad03d23825ea7f3f536b52816a25be5773cd155c52acd3dcd76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other potentially disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

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 http://ehomeforeclosure.org/images/file/lonanavagubemonab.pdf In PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/octg5btt1bh7c0qb21rfvt96g0/75780715954.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/p3d7dnl668m9tujm51co9trfq3/62794512497.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/kipawodawozapuraxe.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/p7teck17kvn5olbgfohtlplmdj/dujemodirebug.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/32s3sbtmppo6fu0o30dj0as154/zajetazololajozofiwa.pdfIn PDF document text
    • http://kaies.cn/upfiles/210619101914469994r37ojk.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/50656893724.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/1385182446.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/meritedagezapiruzosi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738d6913f00---nejowosomepalabatobulizul.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/54ea1cea7bd156b1ebd8f25d4dc5e4a8/dovejajujudumenasej.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/lilekagopizapu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wixivafi.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f4098a5d04844bfa796e612f494d2089/71795089384.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/32th8ehfqminh0qno7h3p3hpt3/25125505392.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9406e0115---98548215457.pdfIn PDF document text
    • http://matras-devison.com/upload/file/89011644566.pdfIn PDF document text
    • https://computerzone.pk/file/topamufemidojowor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=worship+songs+about+breaking+chainsPDF 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_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 10932 bytes
SHA-256: 4ab73556715fa45d13062e4d9adf2ce4f22559eed7b0d1c5929767829a3c4e7c
font_01_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBE 17488 bytes
SHA-256: 82c228f12f9aee3cb40b57d1231c1ae490c9604ac603b133aa6f4b70c2f2f5ea