Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4117d8b1dd5d1e…

MALICIOUS

PDF

76.1 KB Created: 2021-09-02 04:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a81fcb4bdc94d8235a5f6a16c3e03786 SHA-1: 82a20a7fc2b12735f8fab547307ed83d75eb0fc9 SHA-256: 8e4117d8b1dd5d1e7c3ee4109d1eb05923b21b7ae82df72b36188426b2541558
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ff988d73c17---87548434198.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7v967hs95v9nu9cp2t7j4num92/winodubudulurorinabe.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e03f4c770c1---vikezi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bc2a5b4a0---1128708128.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/povujolup.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/46415699677.pdfIn PDF document text
    • http://donghotam.com/luutru/files/93790843606.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/filonopifopuves.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16108312251d22---70989634568.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/72007164087.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/s0khvu8d6i6clbbmpkd4htegh6/sezawalifog.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/09ocsl54bcld6tsq1uqu62st02/69060859613.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/noseruvanarobisupunen.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/lumadokivuxokipadajul.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/6im71d7u8c24t846st685edkj4/wunewebenusakinonola.pdfIn PDF document text
    • http://ccadl.com/files/20210723034232.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/19966d5f568cd04229cb3feb4f94d82b/22911908309.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/53016031712.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9b96ee2f9---75409054872.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/85715747961.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fed30a80c54---wimezufibifusizubuxidago.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868ea26da92---72733206667.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/75450727194.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/igmqidtkfls3itcomq7dsjkqb1/34104694211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=faculty+of+ictPDF 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_off0000cc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC26 15520 bytes
SHA-256: 1938c5de8c7a7010e232228a181080e76c58705cee1d43c1db191506386bcb6d
font_01_sfnt_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 10016 bytes
SHA-256: 9f3e5bbdb1be24e3d4af43be6a9deb4ed5a0d43c4684fc5e26f48ca6f94efe15
font_02_sfnt_off00010a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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