Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a81e7837f2a981…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 20:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f43e93b21470eb014766054188ed06d8 SHA-1: a03ea46b07a12a9590e8d32ca52cee50de7053c5 SHA-256: 84a81e7837f2a981df1d7a2a523f7b558e1ce30d85281d466ccf32278b00c454
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.prctech-th.com/ckfinder/userfiles/files/36025561904.pdf In PDF document text
    • http://deepakbatteries.com/uploads/file/33976546271.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/zuraforurolavojuzozetob.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784590a4381---vupetifapemusofufugapav.pdfIn PDF document text
    • https://pindimana.in/uploads/file/xusajasetujipuferusoxesi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/07b2a7c8463718b23172c3ab3c4ee5b3/revugopizazavewol.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/43840983968.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/mivogizugo.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/tubexaxu.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/poposolobogesax.pdfIn PDF document text
    • https://2acontractor.it/images/file/nigotarorexebem.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/69675079737.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/99866764934.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/66435637082.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muxafujasiw.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/25093031588.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4da3ab2256---93555039221.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/gabut.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/57561046184.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0cf695f36---3312449954.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610f5ade9382b---50093776769.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1aa589a81---sisopigazak.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc9aae1b70---51776254062.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/22e2645c58b1b9573d3ee21510d2a771/kojibumosiboxugaf.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/rolabenivaval.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=christina+lauren+beautiful+player+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_off0000dc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 10860 bytes
SHA-256: fed3586dd54a8849ba542dca7e3927022ae39e463dc9697871a08e677e34ce8f
font_01_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 18180 bytes
SHA-256: 89f5600084c8ef3690bfc8d9aee54a227d414ec92e04257f8967d933207eca66
font_02_sfnt_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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