Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6be81f41b24e768…

MALICIOUS

PDF

87.8 KB Created: 2021-08-21 12:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6e9580e8c390a4595fccd72334774487 SHA-1: 9b5cfeeabf9e44f3b9861ceb18e4b23266d55c30 SHA-256: d6be81f41b24e768df519a4edef4342ffe89a8507f0f12ca53d29261c368b78f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple compromised websites and disposable hosting, likely for phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/nejib6j8v89gpkpqvmpbskfujb/kidelakoxinez.pdf In PDF document text
    • http://www.cbs-emballages.com/upload/file/vapalarisawutebebe.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088ecfa542f4---62492972681.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1626631389_f8b4233318.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ab77e5bc0---nidimat.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/kimaguzivokawevabe.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f04a4624f4---14030219312.pdfIn PDF document text
    • https://vientangluc.com/upload/files/mutakewurirosuxozopuk.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad69c093f52---63652045449.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9524e9cd3f00e9bf5fb0c437446b303f/wuviboxagiderakeneba.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/sr7u6suk5dnulqc0hd0vcfjgah/givejuxotal.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/fifexuke.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/db72453afc59e099f418330d78f7177e/gawexokuwizebunufuk.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/50609413122.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16092db19db26c---19026729426.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/74316630769.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/87cf737fcf1ee5633d122260b8bd4974/53503747275.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/8445654492769bb0c4199a73ed7b2cda/bilagapixuwenapil.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e01e5ee27---buwez.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbcc265a20---wiberinuxajib.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/nojigi.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4df9d91169bcf2cab4b877a602108c17/99521039400.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/56725067395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+much+does+county+market+pay+per+hourPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 17080 bytes
SHA-256: ebcea1251545b535abba646e5e2cf91e715e75c2c4b946a04bde68ccd1cbd45d
font_02_sfnt_off00011eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off0001358a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358A 11024 bytes
SHA-256: f259c52765f771dbcc86a880a32903addc4b913a538e36c3a19380f04d7d431b

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