Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09903d72887f8cb…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 03:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a21d87de28e0d88312fa574c3928a755 SHA-1: c6b0cace80e5b379eabe3cb92b7349e74491f555 SHA-256: b09903d72887f8cbcc67ea79d436165a1851f959a9e41182b25daaf548c47da9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised websites, many of which host PDF files within formcraft or ckfinder upload directories. These links are likely intended to redirect users to malicious content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://arniuniversity.in/ci/userfiles/files/38061251752.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb15141ba---28414827557.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613703e526fe7---leziripakiro.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/27095167488.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/46109791988.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb9f425bfe---64880078857.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/30230239992.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/pufazajusufujeloparaxofi.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/66228576653.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/33875799317.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2305688457e003cd8e6368493897f134/matubebowedanasen.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161406be3d8c4e---19490183674.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/6672963261.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/20/zokoxokizabisexamudutot.pdfIn PDF document text
    • http://rc-modeller.se/images/file///97089026506.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/bujotovorisovebaral.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/84185733228.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/verimagefopaxesozejosu.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/bezupafulamoxadagi.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/sinopexege.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161410d8acf3d6---dotelabekusatogoves.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/872404578.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/moduzewozut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=indian+idol+9+judgesPDF 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_off0000b089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB089 10572 bytes
SHA-256: ee33575b24a7478a4763576926500099fabfc9c441806e727882f63040e71110
font_01_sfnt_off0000c87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87C 15308 bytes
SHA-256: fec2f2155d496697531f5c366aabd2bf0e21fda6681204a02f31be2925f10fb0
font_02_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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