Malicious PDF — malware analysis report

Static analysis result for SHA-256 6802b50df5747281…

MALICIOUS

PDF

75.8 KB Created: 2021-08-28 00:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b30d557a889c4a3fceb8cd5d0b7d47c SHA-1: 415d4015326968ddaae31b44359975ad9b99b2c0 SHA-256: 6802b50df5747281e0fd0ecbaa5ff72b2ced08c9b376cecf39f93c372b8e04ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristic indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://catamma.ru/uplcv?utm_term=the+additive+inverse+of+3+is+and+multiplicative+inverse+of+3+is PDF link annotation
    • https://vayamcs.com/content_files/files/tokupefaketa.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/40800561196.pdfIn PDF document text
    • http://cosmoscm.com/contents//files/9257735322.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202108260638092335.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/bojivinigajej.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae723b669---majasek.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/30935119497.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e2bac2be089---16896427702.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-8-19/20210819023143865575.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/332b8fdbe3f18efc1bdbb896bfe83ca4/sufinebowitezitemub.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/84311315326.pdfIn PDF document text
    • http://gabortech.com/admin/file/wadupiwa.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/43470613135.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/63030830407.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e736993a---48655181698.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/415rc61nm55e8dav1l1m8hq2if/sugegenubavelawedowokina.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160999cb41be27---nolofijemilusek.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714be71071e---14908234022.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/fipidefoji.pdfIn PDF document text
    • https://banghenails.com/upload/file/45856017110.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a7b24fbd03dfd1b4e0ba8bc0881b87a3/rulelupinaz.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/pedanobikaduwewopadeko.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_off0000c270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 16720 bytes
SHA-256: 9e6e7e283443b091ed42361dc7574019e4ae230f1f7d6d5c232422d3724b15a4
font_02_sfnt_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 11184 bytes
SHA-256: 9c02ac4c4d9f0ed3567687f96c143e19c93a84839ef7a1ffe64c7677b0fb44ab

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