Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6e57678d8faf03…

MALICIOUS

PDF

87.7 KB Created: 2021-09-18 04:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9fbad3b9518b5d028f2fed6d5dfbafa0 SHA-1: 670fafa94f85c88b031b8032178fb780ad2fe5e7 SHA-256: 7c6e57678d8faf0341cd2f1a11444c7f30e0df9e032431129f773e3f32285513
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to multiple distinct hosts, some of which are associated with compromised CMS uploads, suggesting an attempt to obscure the final destination and distribute malicious content. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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://rm-parketi.si/uploads/28404382096.pdf In PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/maxejilasowowo.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/25343662397.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/j35iiv969a6c64shmh2f8eosm4/jaluferadokerirumuxavoru.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/batogiwoj.pdfIn PDF document text
    • http://kccmaul.com/files/files/figigowu.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/newevosomilufilum.pdfIn PDF document text
    • http://djapm.com/userfiles/file/9080266615.pdfIn PDF document text
    • http://benetalent.com/upload/files/zefimu.pdfIn PDF document text
    • https://anaksemut.com/contents/files/zuvokuba.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/96997699811.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ovu36gmmnajiv2khgn9t1rdmaf/60459831458.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/piwudedemosegudem.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/dakumimumugu.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/vudimaf.pdfIn PDF document text
    • http://12shio5.com/contents/files/48005719076.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/vowurulonajibaxunadegi.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/bufavutebolelemepajeza.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/529fd7ad679929c2796649e1b73c6b21/36713152869.pdfIn PDF document text
    • http://santabruna.cl/upload/file/jafin.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/pogusazowo.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/fuxumifudujirofezaduxux.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/70637062354.pdfIn PDF document text
    • https://atlantidegattico.it/file/pevesupoz.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/wozobotitirapuxazemisef.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613244602fe04---nazojomot.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f915c17c7---94900993772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=libro+alfa+3+primaria+pdf+gratisPDF 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_off0000e7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 21292 bytes
SHA-256: aa1988016f8196076a62dcf63111613db4706f63997dd58a5f08f6c0ca528c50
font_02_sfnt_off0001383a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383A 10872 bytes
SHA-256: 01ec55e9a2f3d1254f7fdaf91c7c32e027618ac21b1d2ef62d7d228098ded84f

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