Malicious PDF — malware analysis report

Static analysis result for SHA-256 4098a658cdd7f77b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 06:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb5be49e23a0b7aaf2a76ef19e15ac92 SHA-1: 380ca08eb55406ee5e4e721cd510673844e997bf SHA-256: 4098a658cdd7f77b4531c5e2bb7cb8dc0c0e1262bc4b229144f093935ee201d5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains exploit code or phishing content. The numerous embedded URLs point to compromised CMS uploads and disposable hosting, characteristic of a link farm designed to distribute malware or lead users to phishing sites. The presence of exploit-related heuristics further supports the exploitation of vulnerabilities.

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://parfumerieindex.nl/images/uploads/norufazuwojutomumudixa.pdf In PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db9aecc85cb---memejakaw.pdfIn PDF document text
    • https://yifff.se/userfiles/file/kasafer.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/lesuzoguxufarosal.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6d1d0f619---totonija.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2de69fa4a---93583400675.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/5b7kkaiss2cnhai8lj3gpl5m84/zebogin.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/lulikalalenizowovafilene.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/70237755686.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771165293d5---wosiwozofa.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/69335286675.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/mg5anf5ntdq9j6rcme6n3ro67b/67725937074.pdfIn PDF document text
    • http://cissi.it/userfiles/files/vozawumibibamowad.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/e7g8r807dsq10nhgdf5elaopu8/17172759172.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/25146820223.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/74710011084.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/nipuvevinakusewane.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c4975f68cb2a76cc9ef260f1bdc6143e/movimawabilonopun.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/33911499375.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/11662406208.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/69ikic4l41rj8gt498trun1q5v/1336363228.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210901184813.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/23085189515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=find+the+sum+of+the+finite+geometric+seriesPDF 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_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 17384 bytes
SHA-256: 6b4650a18623ae07a5174977ba77720eae2064ae2eb22bb598f4361afd5a9920
font_02_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 10792 bytes
SHA-256: d8d7c713a7c07500ebcd1fa5f3d3c278cc955854696465e4e06e8be504d0fe80

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