Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68b8858dbf30c7e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 21:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f423bf37633956f6867e65da8381f42 SHA-1: 9849a591cf0ee520324bf53c33c71adc025ccdfe SHA-256: e68b8858dbf30c7e74b1deffef96435a93a10e6ac9978b5ce2e5881d0db10f6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and a large number of external URIs, many hosted on compromised websites. The heuristics indicate a link farm designed to trick users into downloading further malicious content, likely a phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=compression+pdf+gratuit PDF link annotation
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/87691438381.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/12090225364.pdfIn PDF document text
    • https://aneri12.eu/res/file/napimipusubo.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/84056799368.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c827edf7a9dee5a02b2b4586b2fd0881/rixonelisulitilotu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d96e6db955---99598919045.pdfIn PDF document text
    • http://nensi.si/upload/file/60162590069.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/rekusoxugibabupit.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8d9cf30b20823b387cec81923d595ba4/mujereviza.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ot2vskks0kr7urvn9fgaq889sg/zedivunumuvo.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/podifiwovidij.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e5bc3e085241c185888578c72f0b8a5d/15652653287.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/sasurijitogizabulerafu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1cf945723---59641266404.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0073541001628884610.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/sa12cv1dkh56sa2rgh5v6g9tdi/12076137950.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beaa6a93500---kefumazebu.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/lafelibajufemujo.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fc63fe0473933931e355674aa55b0a02/xelojutufavurijireb.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/61021530029.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e60df9a73e3---53385656278.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_off0000cfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 10924 bytes
SHA-256: 2c209363721fd9159bcb1e5255fe3e5661c0367f839003f63f217c7011b8b915
font_02_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 18196 bytes
SHA-256: 6455aae045168511d05cfe9c886dfa577ec2bf5b83ec8892bac0e591974817bf

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