Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d65e677b868357…

MALICIOUS

PDF

84.6 KB Created: 2021-06-30 03:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: be8b0c7ca7e73dbd8c465ddd8e3d91cd SHA-1: c844a7050231d8c56d0be107d1486d021bbffe9b SHA-256: 98d65e677b8683575a8a07ea003c8b293987a0d9db5e58d6fa59545a7c319c69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm pointing to compromised WordPress upload storage and disposable hosting. The embedded JavaScript stream and numerous external URIs suggest an attempt to redirect users to malicious sites. The PDF structure and link farm characteristics are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://uetty.xyz/js/ckfinder/userfiles/files/balemad.pdf In PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a952ceba7---zezekojumowetulujimo.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ff96160f---65447966059.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4269bead8---puxakazerabur.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/xeravikajukifonuka.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/gupakaxuwuzo.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/xodabakaluzures.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/6435790a7d5c41352d27985028c83821/tibebubinekuzatur.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/4f32i86fkok219cj5m1ucugdsr/xobujitotuj.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/vugovo.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503045240115.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/samusirukekixuriduvojem.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c23dd8da5a---75866806148.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/merixuberu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afafde39152---93488348767.pdfIn PDF document text
    • https://topupdana.com/contents//files/45740600621.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/fc4942350c3952d89db9f1e0c8f9f61a/junorobebofuwapalavekufi.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2f94356907b38ab283387d3daad34006/fopuda.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/burewuxifosugu.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/32985877848.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab60d3ff5e---jozugerotapiliwarezisoku.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731ff445d43---bofugubewud.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/41135753534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mcq+questions+on+matter+in+our+surroundings+class+9PDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/22445949c955603d025f7bc6ce7fcc0a/vibizibivoropor.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_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 16992 bytes
SHA-256: 174a51e0e1668fcd3e44907ae10e62fae4f28213eba47e44bcd94b8cd64b23d6
font_01_sfnt_off00011329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11329 11120 bytes
SHA-256: d732c33bd9bdecf83f82b95ead4b9a1c1a909de8e398a31307abc181e90c8ad5
font_02_sfnt_off00012ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1