Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2775c7a58c740f2…

MALICIOUS

PDF

68.2 KB Created: 2021-09-25 19:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87e107888aabbde8b568aab277740575 SHA-1: 4c95bbe676437797921923fa16bf4af2d1db7e7a SHA-256: b2775c7a58c740f233f1b93964d51993c81b52abd7ca4cd2b6c358ce34973d24
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple links on potentially compromised sites supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.pantonerestauri.com/ckfinder/userfiles/files/35563476970.pdf In PDF document text
    • http://purofirstli.com/userfiles/files/mebadixewanajiwukelevisin.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/miside.pdfIn PDF document text
    • http://dolgoprudnyj.inhome360.ru/admin/ckfinder/userfiles/files/5372936201.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/93787893513.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/91323024010.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/teguki.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/libotop.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/31678142083.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/dugosure.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb55a319ba---82531035756.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161442ebd9037c---63930176968.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/rabatiwaximure.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/nd6imv61gi66sleu54bqrp0ehp/toludas.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/22446730481.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/21866801803.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/dobel.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/9e766862f58c74fda05fc36101024873/93470339191.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a11509f246---71894189396.pdfIn PDF document text
    • http://partnercable.com/files/90901144617.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/34481811849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=workday+app+for+androidPDF 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_off0000aef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF0 10244 bytes
SHA-256: d672c598b178ac66c8a400a1b1529aadd501f875e3568b88372f8463a8f595a9
font_01_sfnt_off0000c606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC606 14928 bytes
SHA-256: 56eb0a1387ce9b8edfa3a47dd60a27b4e37ae81010cb60ba73d415536c0478c6
font_02_sfnt_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1