Malicious PDF — malware analysis report

Static analysis result for SHA-256 d690ee89cd50f3df…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 09:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d5d97e197f47c9eca67fce06c692cb08 SHA-1: cfd9ea7f3f24a987778da394fee930e9a5ae719f SHA-256: d690ee89cd50f3df9a226bb16d30f5a9b9aa3bf95e3bfec34c19332ea2c9bd11
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to phishing or malware-hosting pages. The presence of external URIs and the nature of the link farm indicate a potential initial access vector via spearphishing attachment, leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://simon-daulte.com/ckfinder/userfiles/files/woseguwuzod.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4f37cfdb2fa5d1d1e192e45f0c1c91e4/27083879197.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210910_B7CAF8DE25B95513.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/15894471574.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/84724251261.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/zulazexizotekinov.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/79537041575.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/41432830129.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/80787990984.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec452f194c---55341496018.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/36742016741.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/pukubelepu.pdfIn PDF document text
    • http://cecev.com/stockages/files/nixuv.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/ronufolivoputit.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/finudimefaduruniredubid.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/29679936923.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/popazeluxizavudademi.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/lesuzuwikikeluxob.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcdk3htbhj09qtg64v1cdj2c66/xuzovekonakezisolewupa.pdfIn PDF document text
    • http://scsychem.com/upload/files/rodezasepapekizus.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161327cb23e4af---parob.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613584d1c524a---kumizu.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/25134101886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=droid+turbo+2+screenshotPDF 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_off0000d293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 10620 bytes
SHA-256: ade5a1772884918c590dd1b0402f472f71fefab74ed2fa58ec9f1b6b17a37418
font_02_sfnt_off000102eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 17788 bytes
SHA-256: c517c5b9607bbd5c34386d02b82bb1584ee669cb639aac573dd6f0bc62ddefa8

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