Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f08ef25c7c77f1…

MALICIOUS

PDF

76.3 KB Created: 2021-09-04 01:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7772108b4fe564a671ef7aa84d661cd9 SHA-1: 92714ffc23989f2fa7b033efbf2bc67ac6877e83 SHA-256: 57f08ef25c7c77f12353abee02277afb4cd79b560715c27fa3313d16c3d78b9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://villanakarin.com/userfiles/files/78529753945.pdf In PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc02b835be---ninigojaremujibif.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/10412487172.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/tutir.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/1766fcb390a7e8e83f5f4d85b33b1bc3/55981662719.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085c2904d909---34309098215.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/50787901599.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/dolegirodurilosomiboturo.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/zovositatijaxepena.pdfIn PDF document text
    • http://feast.to/upd_file/81266649698.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/62438538811.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ign1f6r9p1escoadu9o49ujen2/pibadamegisanimasuzaxex.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/kasasevon.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/7e2a35ef6c02e6508fa70f41e69a17b9/niwimatudoxa.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/loxigetegulidok.pdfIn PDF document text
    • https://aful.edu.pe/ckfinder/userfiles/files/43192752312.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/39985064469.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/2a1e91f6c011d5ac84346bb91a3cd940/ludubiwis.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/65959109537.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/zejef.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/mobulenusugozedulunuzav.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/87093628393.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a6e769093---jogusagirumad.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c9d0a7f328440a55a099863aeb2d7d01/zagumufumosuwe.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/89200031367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=converter+pdf+gratis+para+wordPDF 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_off0000c744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 10808 bytes
SHA-256: bffc819486066094ec79725d06b71e9cb139b20c6a2f37530e6a388d7729ff5b
font_02_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 16784 bytes
SHA-256: 3fcdbabdc909f3c9b6e80e3ce134ede1e605e61c9bc9f1fa4b44414feef26ee3

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