Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd9017b6f1fbc98…

MALICIOUS

PDF

78.1 KB Created: 2021-08-26 20:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 75fe7a656fb303cc1b28a8ba317419df SHA-1: 01fd28aba66c8eed24244dd5aeec4a2609d38b41 SHA-256: 2fd9017b6f1fbc982af7f548ed1ad99338400211c9bcd9694707ded3962cca87
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. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/uplcv?utm_term=still+i+rise+annotated+poem PDF link annotation
    • http://kalikraft.com/images/file/konib.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/9r50sv7452ljp5gkumaci75ss8/24346444416.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/kurojamux.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ti2lao6r7j3s5goodsic95t3iv/23006755222.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834f7b449ca---batuvibepupemurekiz.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/fiwibitebepuxelidawik.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/kgqmaniptt63c4smo6vu9tv6ji/jalelupaxanunuli.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/54133899441.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/44825171099.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/37069084399.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/20141789644.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d100201dc3---vepurerojifopurorowi.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/1550975029.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/porovadegelovil.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/nusedolika.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/kaguxarikudojanatizitus.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/65847667711.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/98518590228.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d2330c32d---27426501610.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/zifumefujadorev.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/bokiguzawoz.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/filijidusobik.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5cce41cee---4669043679.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_off0000d097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 10628 bytes
SHA-256: 722501c5e5dfbe513f847dc9d38791c527cbadbf451d0251f16b1c1e48f810ca
font_01_sfnt_off0000e8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DD 16232 bytes
SHA-256: 5a34606d6fd8b410d71b267149e4162fd7758c8a270846792c8d639658792fc5

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