Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e92dbdfc994e9d…

MALICIOUS

PDF

96.8 KB Created: 2021-07-13 21:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a33f4d401a3ce1239126b17b29146492 SHA-1: 250c402dad013b1fdaabb2685d317e3af5cedb9d SHA-256: 84e92dbdfc994e9dd75d40e3ab0567f1eafbf4e1114e0afc128a18d0c108d425
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristic analysis indicates it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/64b362740ac5aa578266706445d3a532/12791413974.pdf In PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/83f750380d298bd208e01e0af1172627/pixexosokadewuro.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/27447597384.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/sesepug.pdfIn PDF document text
    • http://didopack.com/files/rifuwe.pdfIn PDF document text
    • http://tfforming.ru/d/files/befif.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/99113547740.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/92782198442.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/5c230c4199937c2eff460af23d4381f5/sexifoneduzivovutolesupaz.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/5l9e4urv2resdeaqm5mqo98ls3/limamowed.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16087aac0b3f0d---21919255692.pdfIn PDF document text
    • http://htwy.com/upload/file/86427026457.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160856bdb50221---dutedarupe.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/25461771128.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/futoxid.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/8291a2eb93f8911a0ccab916b9bbd5a0/vuzenukominazezeni.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d18c26cf9---lewutuwipilometik.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/60526654495.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ca24b0248eb2db39ed9e3b77bd69f1b9/76461965494.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/35902630726.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/fokuwukoluxadilijugu.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/20106523098.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/030904294558.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75872f40f---taropunajeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=rf+value+calculation+examplePDF 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_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 17376 bytes
SHA-256: 35cd4f128d3ef0f7dd3b78964ee71f73dffb9455f5b90290a77b9d087d4e7d84
font_01_sfnt_off00014573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8A 10684 bytes
SHA-256: 6c5b4ffe6c2a672c09083f28856706236f341ab3bbaf2e0597c483d1d44396a1