Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a9a28046f74b96…

MALICIOUS

PDF

75.1 KB Created: 2021-09-14 05:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed6b53b429c07b5205053c611491d252 SHA-1: a95bc55d05c0fe68be2a9112d68559a978f01777 SHA-256: 65a9a28046f74b96235d028142dd84e9bcdf315f91ca7d942db93c84502b9bd5
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple embedded URLs pointing to potentially compromised or disposable hosting sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gavionescodeinsa.com/userfiles/86403350602.pdf In PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210905164829.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/pixiforovobato.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/sozilonegipuvijigapolo.pdfIn PDF document text
    • http://compsult.net/userfiles/file/fexunibuzinigebaz.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/52518661773.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/86021648578.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/45235720774.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/gupupojuta.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/sizibudomafawizirawe.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/75555803755.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/rupemanaf.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/73886970192.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/39667396097.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/77875885301.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/zowujol.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab334cd4f7---7341773045.pdfIn PDF document text
    • http://lawngo.net/fckfiles/votifirapewo.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/cdcb9631d14b28d4baa667b831dd5fe9/wonuboguserulagufojotos.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6063675e---soxetibizor.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161380fa72c880---47891031170.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/jadofajupezedejebujemibi.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/biwizirugedewabovojoro.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/wivefaxade.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/powudij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pattern+lock+onlinePDF 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_off0000c5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BE 16280 bytes
SHA-256: 6eff75cfce77f4d3ad86d59d57a677e6f5f4970b4dab65d6d28b0b1007b21080
font_01_sfnt_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 10148 bytes
SHA-256: 4096a6745bfea0f47b2b21f2823f41e398847a1de7d6ed0668654bc945ca8bdd
font_02_sfnt_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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