Malicious PDF — malware analysis report

Static analysis result for SHA-256 67047531e71a9ee3…

MALICIOUS

PDF

163.4 KB Created: 2021-08-06 14:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4968deaaf08e0fa6d28235f6f27fc1a5 SHA-1: f3a22506de2a03ef583f661e97cf2f06169fdb92 SHA-256: 67047531e71a9ee392b0b206e53e8f2c8127d345231101cea0fa15abce517190
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the document's primary purpose is to redirect users through these links, likely to phishing sites or to download further malicious content. No scripts were extracted, but the overall structure points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/206f07cecc5b17ba021dd10cd0618002/16590403990.pdf In PDF document text
    • http://valdhans.cz/userfiles/file/87413823643.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/52478329869.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/82ef1facd4174d68768352d3fa73c6d8/18991332920.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/641c97c542919dc15f118a2d2c23cb2d/surofigo.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/68642411708.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d97953027---wegajatasujupinaxapive.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/zopabo.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607dde5d652b4---29333995406.pdfIn PDF document text
    • https://heyratacademy.ir/file/5876158946.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/e7nqlhl1mvkhu00u68330r0bek/wunekikotulemunuw.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f991d5c004---22616182181.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99b9a33d2---5629507107.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/u9qk2jqn74qp182hr6elp0sg4t/fuzuku.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b4c80a03c---tesowukalozejebediw.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/daxarimipubeletejeb.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/nuxamuwevaxifaj.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/12bfd17937f209526c229aa5f26d3b25/lizileg.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b191c43cc419355cb141b3f74799f869/pavazipomagur.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77adc55f58---xedeteguresajo.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/97997907776.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/31291069059.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4b67c3331564d98ac3a7719af6dcdcc7/pofibovozexamanim.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/ruzon.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/38233509614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+ruby+the+prequel+apk+downloadPDF 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_off00020abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20ABE 23116 bytes
SHA-256: 2f9d3e676e7c9469808b6c86deb151ab2e87d581be0247b73e4a161d5f7a37c8
font_01_sfnt_off00024295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25AAC 11076 bytes
SHA-256: 7c1da0ff350a2fb1be98ff9467487e8a61377d3ed547aa1af2d159ca4b6141d3
font_03_sfnt_off000273e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x273E3 1988 bytes
SHA-256: 6b2f43824ad5fa079027f6124f3a4ec13044ba9b23b509f2df3d09a54c1bd94f

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