Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f89acd764a12165…

MALICIOUS

PDF

85.0 KB Created: 2021-09-03 10:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12cffe5749c2ce89f3803865ec5f5d8d SHA-1: 5c572c8e9bce2ab2441aa566ffb4778e6e07b800 SHA-256: 1f89acd764a1216565b5815196b39cbb76ff3e09f64e876abda0a5892252cb44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute further malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://canhtoanland.com/upload/files/17664938919.pdf In PDF document text
    • https://bamfieldrental.com/userfiles/file/kifoliwota.pdfIn PDF document text
    • https://tavio.ru/files/file/20308479345.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/dugazepupetadosikazu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef7e2ab31---24622832829.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/3a81462c2ce830bcf591967d56dc3c50/nixetotapivunigara.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608118a22bdd5---xesenovuxadotelekalisixun.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///37583622375.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1eb52d1aef370cee5227a6b25a28e9f5/xupidakokuvineralujenugi.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/zagesabuxobakobiwo.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/5urp55291rdodk88j0o7vg27k3/64554108096.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16089cdd146668---sexumevuritasuzelibena.pdfIn PDF document text
    • http://yejida.com/userfiles/file/81163140079.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/h4d1rr6seu6g5shvipkveao883/64365274423.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bf946b7bcba34883430cf2b05d99f7c3/wagekepifonigimuzafuweju.pdfIn PDF document text
    • https://airxps.com/userfiles/files/voroxujufebapufu.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/relojisokelixaxivopivupum.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/kukemikonobuwekinajap.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/nefupejuxofaf.pdfIn PDF document text
    • https://campermagazine.tv/public/file/44210108492.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8f40becbe4092aa8eb9b9285e37a7b85/31692611015.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a251b03ca---gedeti.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161163cbfadede---65255482804.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8544382e2d---sesavabebuvufu.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/12530855329.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/080148a7fedd97701e4f59b7520334a5/64573022933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=rtmnu+mba+syllabus+2017+pdfPDF 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_off0000e471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 18300 bytes
SHA-256: 389be16fd005f5ecd12896c69baaef4e60c7065c825ebdd741594493414fed54
font_01_sfnt_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 10956 bytes
SHA-256: 3bca97da8fd35662a9e4aa3e06367593e291dda9e8b2ab0fb90d41c5c71c96eb
font_02_sfnt_off00012dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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