Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38ebbf1f7874405…

MALICIOUS

PDF

99.3 KB Created: 2021-07-06 07:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 181bca0ab233b27f2632c2009783ab5c SHA-1: 1f9d3138f322e4114ccaffe3bedcdc9299bc99d4 SHA-256: e38ebbf1f7874405c4b5f7092d0306d43007ebd0927872e7c65f195090fff0e2
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a tactic to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to leverage external resources for malicious purposes, likely to host phishing pages or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 https://queure.ru/uplcv?utm_term=ariana+grande+thinking+bout+you PDF link annotation
    • https://aradovan.com/userfiles/file/moxasareso.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608669bec6871---41617502417.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/29700118165.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/lcigoh46om3hmp7p6qfauu0ien/rixudu.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/ruwapazudevi.pdfIn PDF document text
    • https://andana.us/files/files/96906798140.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162313961686.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ea5d7c583---63632059093.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/lurikok.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/gujidamixo.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb18e2f81---84035601994.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/95859221557.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/8e9d3ac88e99b85454f48b5b7e591d3c/zegiloxoxud.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/139c95f744e54cade9c147745ecdf3bf/90871476917.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/99588460150.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/nujebesezinizapal.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210623044353967.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a52f9d4c37b---75868875987.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087cff763c74---19055334842.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2c1be6ed56da654bc5ddc8041728ce79/34842795413.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/35d412976b80569dd3857d4cd966c9c1/foderuvasux.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6d769bd74---dufeb.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee33848bc---36173024809.pdfIn PDF document text
    • http://www.toptehnik.si/images/gevuga.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/vumujod.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 2920 bytes
SHA-256: 5c4419162a1b7a9e8eb517835286feb72054805e91c308e5ec49719230653e10
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 16504 bytes
SHA-256: 5ff5dd150db3793bff330e6cbd2616dee2ef8780f80d3cd3c36a80e95767b3c1
font_02_sfnt_off00010cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 1284 bytes
SHA-256: 3f2eb68e56e0cc9b24f861ad510cb196f24dbc520975aefba06cb0b93c7ac786
font_03_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00012c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C73 10740 bytes
SHA-256: 181884b6e7d9430897c7bec977dd3f2261feb959fe900e8ecd72ebb722e467d2
font_05_sfnt_off000144d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D6 21548 bytes
SHA-256: ec46df8a46bfb3ddb12788cc032988f9f79837b915e5a8e26223d7fc40cf545f

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