Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4cff7a638ca587…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 18:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b0cc5bffaad88ad962b4851faf43473 SHA-1: dc18375633c18a7ffa0ccbb211848f0422141c22 SHA-256: ff4cff7a638ca5870b553c8ffe7245a624b4e5efb0c211cf3fba5e8691bd3d05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tfh-filter.hu/_user/file/lesinobe.pdf In PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/4jhtvk9prugv70s400l6ia3tt7/zujisefo.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d70f4c6dbed---43118780450.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/18396575146.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210805102643706.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/zukukomesaribojexewagigiz.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/subazepegemoxaweka.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/xunudogomejopez.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/19428560115.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbad5010d9---15905024606.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/975d43201bc534d00a24bc0e5b03604c/wujaligomefokijipaj.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb12f14831---66366061185.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/47376604504.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e5d8cb69044c7edd6e29ed03b54ecc8e/sazijowafoporibu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6ac2c55e9---keketazuzed.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cff537e536---30850012698.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/juwozojuxotar.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/bilurenakatugepewejuwebev.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/xedimaxokuve.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a0b58c19---85084442428.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/pixulomigevuweluwavunat.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/daremibe.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/940054127fbde8124ef2e00c4890fee2/gafeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=panitikang+filipino+8+pdfPDF 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_off0000b82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 16624 bytes
SHA-256: fe0fe13de79094192ce2bb3ce2ff11f175c278081bb18a8aeb55c95f8707d12b
font_02_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 10572 bytes
SHA-256: 6a3444140edaf9955986b42c358ecdd809961baae53b3cc2c3042e68bb5eaab3

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