Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf9845de1c69e68…

MALICIOUS

PDF

134.8 KB Created: 2021-06-26 11:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c3f5cb417ff933703442b47002d45c4 SHA-1: a13194ccf7b59afd098c3accc4db02f5b8c6a269 SHA-256: 8bf9845de1c69e68fd9e536a61e65fd00189ca146ded76ef5cca81255980f1c6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to distribute malware or conduct phishing attacks. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://autoteam.in/ckfinder/userfiles/files/26464848099.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608a690cadafe---48921752518.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/a1nh9tusbv5agjtco9freo5137/625674354.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091fa25cd732---64663828337.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/18370310007.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb357e8038---49695603905.pdfIn PDF document text
    • http://artside.org/data/temp/file/74271277217.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/27274808681.pdfIn PDF document text
    • http://arslanemlak.come/file/86048057557.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/dbq5b1t6dc9jf5v6jdtu1fboun/35082032674.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/tibaxurife.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/i4jva4nr5jbdifhr57qq3mhbpo/22565220066.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e4ec7336c---91722175810.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/64b55f97dfc18fe2890223a6ecb62987/46823565184.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e1329b10a---88028647383.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/45922197562.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/410685c476cce2b1aca04b0c7233b6a1/fitobidojanaz.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/wapebuxasagewe.pdfIn PDF document text
    • http://wirheiraten.de/images/file/paropavub.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9f08a318569f8a2a1ecbbfaf9e4f71b5/59859906029.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/50nn3usp12c7qndsehnb8n8o00/dafoguxazafofusemefudiwel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=latest+version+of+fifa+mobilePDF 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_off000188de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188DE 10540 bytes
SHA-256: 20feffae6971512300ff57921f1ab8f2a6762c7c8890eef7d64250a67dccea96
font_01_sfnt_off0001a0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8FB 16760 bytes
SHA-256: 86039cfe567277ef5bba4b03a5dd45297b3c7768b99e7342594f3cbd88cc620e
font_03_sfnt_off0001d09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D09B 27836 bytes
SHA-256: beb9a14827e30a1fa5f175b4bde7c7b9ec0e2732686c567f085f267c54edb936

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