Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65d47b2f5adf8d9…

MALICIOUS

PDF

77.9 KB Created: 2021-09-01 05:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0853daf30880b951e0a41df69b0456f SHA-1: 84fd53101c0f99efe3a027bfc160fe7ba6f04140 SHA-256: b65d47b2f5adf8d995630ff170e80fc106aa9bc32136909cac3f5f95fef242c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as containing a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites, potentially for credential harvesting or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6cb9631d8b3e119eca6e2b51155b51a8/bexabuwudijam.pdf In PDF document text
    • http://belst.by/upload/file/81289179132.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/momuletosebefovadexovi.pdfIn PDF document text
    • http://katachizu.com/img/news/files/lebiwumosalaxamifegud.pdfIn PDF document text
    • http://burnettefamilyreunion2021.com/clients/867108/File/giguxe.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/vjreo17er13rk29kd0j4ppr1oj/47320241711.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/kepazuxijunejedovikuno.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/patotif.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/28684599038.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/sixejabaludewemulus.pdfIn PDF document text
    • http://beateromer.com/bilder/file/xegikilugowaguxor.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-8/file/62846559593.pdfIn PDF document text
    • http://dothi.info/images/files/34908860673.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/2ffe7cc29556cd0449c7e5f72b46870a/31932699381.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/savulelutozesogojus.pdfIn PDF document text
    • http://master-vin.ru/files/file/97398588131.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210630234354_oyiex3.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/84294802674.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/83819292092.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/75496868359.pdfIn PDF document text
    • http://hibertek.com/image/files/20210725_084556.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/gonovusawawadasif.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161055f92e575a---98859027857.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/lixowason.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee370cde879---34804790537.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/cq6mdei86atq7a6buhgtp41t4u/52151368337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=examples+of+liberalizationPDF 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_off0000cdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB9 16408 bytes
SHA-256: 0614bb162ebca3846ccc2d53bd99f0d5064efa42a82370261b35d05f2818daeb
font_01_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 10804 bytes
SHA-256: 00756739c167182c01e69678c33a5e4212570d22fc2eb0ab12080cce3795f827
font_02_sfnt_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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