Malicious PDF — malware analysis report

Static analysis result for SHA-256 130f19df15eba2e0…

MALICIOUS

PDF

103.6 KB Created: 2021-09-07 12:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e1c1c42671ba336f2212edf1b5e1f0ff SHA-1: cf71ade7913b1413ad4da55f1c385f8ee96098a7 SHA-256: 130f19df15eba2e015239142ac539a56220adbce4fa15eb04f0f820cded870e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on different hosts, suggesting an attempt to manipulate search engine rankings or redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://crewmak.ru/uplcv?utm_term=walter+riso+libros+pdf+gratis+enamorate+de+ti PDF link annotation
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/97599815925.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/6940653755.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609153ef18341---71607986002.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/zifarejawaxif.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/25256885687.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/25588269244.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/rexedosopiwarade.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/moxizukagulilarira.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960e49add7d---zanexukux.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607caabe9b6cb---22162996225.pdfIn PDF document text
    • https://megashina24.ru/files/files/newenugujudakuvunufizoja.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/6b743aa1e1fa3b42c909137992d38ab5/98219351288.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/rakizoxakupapijalita.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/4641804000.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eced60a5c---bixebukanefabolezek.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/1inljm40urjgjjtrcttv02f6jc/kebuvakekek.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/tutitipuko.pdfIn PDF document text
    • http://gptools.net/userfiles/file/39634902724.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/pobiluzibazokemuzovav.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/zajizanuxogibegirapo.pdfIn PDF document text
    • https://asken.as/bilder/file/rifedodisunamuvezokuw.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/22301315094.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fc9828575---52420035793.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5ddc324bfa7e43742949fc0167a73060/loxuxasitixeji.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/63350583848.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015b8d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15B8D 18028 bytes
SHA-256: 34a6f1155915bd5174e027f8f2f2e0ca5c9d62df9a46581c077b4c2c2de79c4c
font_00_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 10976 bytes
SHA-256: db9ead8208725859de3369912163f95066efa3eae8316481310f39ed550cfc97
font_01_sfnt_off00012af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF1 18964 bytes
SHA-256: 1d7c971e0e728cee45145d000a4d3a1f577515bc82322f7cfff27ce0408fead9
font_03_sfnt_off0001779b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1779B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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