Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfda2d40af64e502…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 20:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a5b61836fd030ef553d24a80c36a275 SHA-1: 60009bff3bbee973188fc237ebe3c47f85ef3cdf SHA-256: bfda2d40af64e50244dfdb892725b9517476faf46ffeb53d720cdf4fcf69f194
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. No scripts were extracted, but the overall structure suggests an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pmcp-avac.com/files/upload-ckfinder/files/80412258909.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e309797d86---saget.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162ce062c3---wosep.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/notapulovobabosebiw.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ef215bb2f94f1bbfd2833cd52b12e5cb/72969752026.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/dilirepeluxuratejabof.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161458cc4c9203---topitebatanoruvanuruninu.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/3853767189.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/mexulu.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/jeperakagu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136edafa6c86---semedujosebewasawizi.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/45479584670.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/sifajirilupitu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8711c3b5---wilalepojawalolodo.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/101ae586f04398708a1adecd8fec4248/rutej.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/fepefufusowedixozide.pdfIn PDF document text
    • https://felicityokolo.com/file/lujiwan.pdfIn PDF document text
    • https://angkalaris.com/contents/files/mafotuxamaguj.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/nolemu.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/51547177800.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/99519342396.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/mijanopenuwazaler.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/vizulakin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+use+extension+in+mobile+chromePDF 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_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 17916 bytes
SHA-256: 684a1fc220d55153f660ac9b4ba02b81184dcbe55eb00551ec228d903c1f4ac0
font_01_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 10752 bytes
SHA-256: a4dc307f3cf5ae16a13cb3999212c27d2f13050faf13a766be35de078fada3e6
font_02_sfnt_off00012093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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