Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8e663c2034a050…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 13:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 689410e1e8768349bf91d7003a7a07a4 SHA-1: b895fd04a597eee6aed9b057c5579fdca85fe0e6 SHA-256: db8e663c2034a0509ebaddd68b4073d3150ad594e1a137842daf22085c179c1d
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves leveraging these external links, likely as part of a phishing campaign or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://bearings.vn/images/ckeditor/files/mopewabetokijo.pdf In PDF document text
    • https://rmp-familienanzeigen.de/cms/files/zowazapuderubatubi.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/hanbrfa6ntvm9fc6cc8dbfap2q/nawugakatigo.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1823819267.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/xijigewisulukajupeb.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/xufokawikux.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7881b9b502---34266256736.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/62402062399.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/vorale.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/44566704486.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1caf5614a---mavaxuripu.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/37793722147.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/48101309230.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/85cdfd125f03152808b55f0ce313aff2/pozabinosefujamafu.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609846dded0ee---89520939521.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/gepulifasolubi.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f33d806a113edad7ca7041707f85b3c9/fodobulidaxaxorut.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf5a05af5---wolijuxagabilarijaza.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/39988299600.pdfIn PDF document text
    • https://cmoretv.com/userfiles/880389541.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b17ce6b80b---72437771804.pdfIn PDF document text
    • http://orderkai.com/uploads/files/farex.pdfIn PDF document text
    • https://sy-tech.eu/file/zunotorizasonoxubugufevik.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/90642931535.pdfIn PDF document text
    • http://geoman.cz/data/file/wufurativadagesigoboxat.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/58974841260.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/dapakinowesipasupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=xigduo+bula+pdfPDF 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_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 19772 bytes
SHA-256: 4e572596310056a91a9bb3a392568ffbcc34d43082fea785eb4835c5523c754d
font_01_sfnt_off00012575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12575 10316 bytes
SHA-256: 2dc31cdf4400b55e3709fe93d1cf4ec57434452526ab727de85778a9c6844094
font_02_sfnt_off00013c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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