Malicious PDF — malware analysis report

Static analysis result for SHA-256 41747e62f4ff193f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 19:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f200f16d490bb1331984d3f7ba7a6141 SHA-1: 10ff6053972541a279a0384e062ac0dae8019686 SHA-256: 41747e62f4ff193fbcecd8f5eea6250086f1eeec971d711672f0c602dfe4da80
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing structural elements indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613567891d306---fozupowujumasuvawijekoj.pdf In PDF document text
    • http://caerulumpharma.com/upload/files/57226861388.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/50955472846.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/zezunatidupi.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/wifegoweduboniladigunu.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/43601060776.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/gerelalepironum.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631178394tJsB.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/16730931211.pdfIn PDF document text
    • http://candientuvibra.com/images/file/34039300233.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/vofoxitaxalijepoxoronako.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/dawajinumedasapobunida.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/kumaju.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16134278a38f93---vejerame.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/69200417849.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/vuxibev.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/87854550365.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/99929055065.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/68805879603.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/be96492d7b3e39d3bcdc2aff5d5830ba/95239325677.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca0ca98c5---xoral.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/98364367882.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/9427734005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=list+of+words+that+start+with+sPDF 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_off0000d69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 17168 bytes
SHA-256: 015f9bb30df8bde0ffa233d2f47953b70e9a532a4ce0d8822d2fcd06e8f7110a
font_02_sfnt_off00011a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A84 10212 bytes
SHA-256: 88da9de3e65609915d16211f4475d83758c3c1e50a636ff326d1895bb93ab7e2

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