Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f1df5049d57a8b…

MALICIOUS

PDF

87.1 KB Created: 2021-09-02 17:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 65a8dd1015ec2591fdc632e842485d3f SHA-1: c8680c718883174ebf3f56a7e9f3660d544a89ab SHA-256: f6f1df5049d57a8bbd29dfc58b4f373466ec3b57388c1c2ef6162a3f4d9fbae0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to compromised WordPress sites and other disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=breakfast+of+champions+analysis+pdf PDF link annotation
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/17d0a1ae2723725b97c81f587670729f/tatabemabepa.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/kopigukutaberesafe.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/8778874096.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/bd639f8dba952ec0c2d9fa1dfb58b62e/nasemanud.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/zubefokurobulumiti.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/zogadotir.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085813cce050---95381427721.pdfIn PDF document text
    • http://chengzechem.com/upload/files/2489934741.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2c5ec36d---56324457704.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/34029118588.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16105c4f3a47c2---tikebubitinujesidova.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/bidofofi.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/1b750225b4d97158659dc7b13bf20df9/82851793875.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1160670ae---88533361498.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd4eec1aae---nitigafalubulirozuwuduku.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/fupozeralifa.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/sejovuzilawozipenuwus.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/k64l83timgi4uc3bfs2cvl6b56/58101150748.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/823c6d75e6cb74b261f8f4393a52e1b1/konaronuxurigubug.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/kepowadilejenupituve.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610a9f78567d1---15241143710.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/livatabivevubuzajupujaden.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdc0bf1eda---97424191874.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/69ec61f287329f825443dc3f8d2a22a4/61749079436.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608807a1b602b---18580287215.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_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 19816 bytes
SHA-256: 38e5d131aa4d4760f28216363a2054062e1abedf5ea70ea8d57ee2fa3bcc306c
font_01_sfnt_off00011d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13533 11144 bytes
SHA-256: c1653a6ee764e2acec933044b0092b798e70dd714562ee73cae675e170c9c81e