Malicious PDF — malware analysis report

Static analysis result for SHA-256 55815662852c64cd…

MALICIOUS

PDF

86.5 KB Created: 2021-09-13 03:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f05ca02b9cb05797c01747a2b3538d04 SHA-1: f7e9547161ff4c668aedab4b91a9fc086b8b32ee SHA-256: 55815662852c64cd211c8cc348ea3c886a8b6b50a4b9acac262c53543dac62f9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sigmabhp.pl/userfiles/file/71221623729.pdf In PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/magugavadipil.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613950d30c82f---35675962925.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/25630397396.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/nadimutiweporumajod.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/kizapujo.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/92277854148.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/65556457559.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/jezemevojedosuladebalogin.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/norosojufubu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bfd082869---mutijoxe.pdfIn PDF document text
    • http://taxfreepoint.com/file/zugorisa.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/42228567960.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/52217835346.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/rinimofezezuluk.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/65847421967.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/daselikov.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6cab079cb---viratifuxumaxi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ec75882d0a2c37104ee01f6c951add16/xajajotudifodogexax.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/voguramukasevasafolix.pdfIn PDF document text
    • https://kaparatt.com/images/File/92170281505.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/belofutekusowujafuv.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/59106606900.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133abc76f6b2---87357944837.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4218d15effe28867183b6783caea27ba/70665951532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=friends+all+season+subtitlesPDF 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_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 10456 bytes
SHA-256: 4023a4e94988878d0c4e8c594fd5a62400fe6466919f2ec8259d19a99c294630
font_02_sfnt_off00011301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11301 21996 bytes
SHA-256: 7ec54ef2069df60905f523bf482e7eefcb46f5f0bac3828a32484e394e19ca4e

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