Malicious PDF — malware analysis report

Static analysis result for SHA-256 b784065aca415d23…

MALICIOUS

PDF

98.8 KB Created: 2021-08-14 06:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 19fedab6281412c6cac55da7e5556439 SHA-1: 3e38f1d3c396ebe33c88d1cc2f5dd8f0ad7aa10a SHA-256: b784065aca415d2382efbeaea90bdc4f4c9125af04ca07ff130cf1019bc1414a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not directly executable in this context, indicates a potential for further malicious actions if the PDF were to be rendered in an environment that supports it.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://laborke.ru/uplcv?utm_term=1+to+1000+number+chart+in+words PDF link annotation
    • http://yulintimber.cn/d/files/fuligiwadejomag.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61313de403---66800710107.pdfIn PDF document text
    • http://ledson.ru/upload_picture/88780881748.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6daa532a3---mufukabekufase.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610be78f910a1---36688927477.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/55a163b187b4d5c360e46681bfd92013/lobetilomibudulabapupe.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16105e457a612b---24687004474.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/ralolav.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/81327042644.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/16183691070.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/sugixiju.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/gobuvejafipokodujifud.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/wowutogefosifipukeso.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b20a05be380ce0a591990f1d5ac2b5b8/28179724845.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090a57e82ab6---gulig.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/34595493634.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16113040050d3f---muledewekopalaj.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607439c4ec3b6---74001628188.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ef421f101---74367124090.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/38447612722.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5cfdad8bb---99266928700.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_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 10992 bytes
SHA-256: 2b2e4a46401772efa0afb7c12ffbfccf6ce996241ebd40645834c0c544cf6c6d
font_01_sfnt_off0001376a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7C 17312 bytes
SHA-256: 727d7b8747e01e7a7780b1da2af4036d681ae0222ce11368d6186c86b11003df

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