Malicious PDF — malware analysis report

Static analysis result for SHA-256 453d538ff2cf4a9e…

MALICIOUS

PDF

95.2 KB Created: 2021-09-05 06:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f0dcc85e099b13c3f47b88d1fb6bbf5f SHA-1: dafaba20296b14012f1560507d20fdca27b0c82e SHA-256: 453d538ff2cf4a9ebcd8be1529cb7123674894a8f6f086b8caa0f4bcfa0f3ccf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and a link farm pointing to potentially compromised or disposable hosting, suggesting a phishing or SEO manipulation tactic. The presence of an embedded JavaScript stream further supports malicious activity, likely for obfuscation or to initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=guia+zambombas+jerez+2019+pdf PDF link annotation
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/bowonumedaturiruzina.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/60073858515.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/jiwiremom.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/fegenipanajipawalimemi.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/44986790781.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/fugudokar.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/q3oa4jsdp13i5as7a5vdn55q53/bibegaruwagivi.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/bafobodipogigaj.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f979d4360---favadagilazaxojad.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16082777266001---foxadobiwixozov.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/28587555422.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/12497545478.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b89798e3fa1---tetowokeribiti.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/68834248705.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607574a7e0345---33513399590.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/badojegatenavenow.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/nizopinat.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4b3c1720eb0ecab53629bf1dd94978ab/16362559934.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ec8d05e31---xuxezaraxokawudimevijo.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/70511907506.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607797d98aa6c---fogifigomaduvisep.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/60682793073.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16070fa4e73b2f---dalegat.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daec01ec54a---46236247180.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/janubudilekutalezojelijeb.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/9601413874.pdfIn PDF document text
    • 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_off000108e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E5 11340 bytes
SHA-256: afbdcc443fddbb25c4c85bf5f7802a3b32371216f2bb792caa8a3b8b03f7cab8
font_01_sfnt_off00012375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12375 20120 bytes
SHA-256: 3dffd7bf2eab4c788f07b02a4cb51774e565770772dd89bee94186fa17761f3f
font_02_sfnt_off000155ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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