Malicious PDF — malware analysis report

Static analysis result for SHA-256 08bb8d5d608c3d9c…

MALICIOUS

PDF

91.3 KB Created: 2021-09-03 15:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: afb303b8b177e2629e439686e7cb8e19 SHA-1: 05923a131b03cfb1553b93f2b2d3fbf22f630190 SHA-256: 08bb8d5d608c3d9c18d56e687c73b6a10fe6c3db3493c24dd48bf8fb5e72f7fd
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of a 'Macro/content-enable lure' heuristic suggests the document is designed to trick the user into enabling content, a common tactic for malware droppers. The document also contains numerous links to external sites, some hosted on compromised WordPress installations, which likely serve as download locations for further malicious payloads. No scripts were extracted, but the overall structure and heuristics point to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b34ec0b9d---naxoruzotufotowukipiwolut.pdf In PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/dumaj.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/ce6d8c5ed91aecfe3403c624e5793f51/wabif.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/39200461671.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/74141789889.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/xizosibinosigomiwiboko.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/15815863800.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/renuvexe.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///zukakutolojasamuwobuwax.pdfIn PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/jigisawevixa.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1424d7686b---62056466223.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c891312a0a---vifarenamunipag.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/rubstsg5fbo43elcuvprfudq3q/30610864874.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/40aeabedc4af3fc391dc00c02ca54c0e/91233448228.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/70133329973.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/75822236321.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/bd1696d7f8b96db352bdf6a32a36f8d0/27396426878.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a34b9eb5ad---22784498881.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9a56b25611f2424b04f7e32cbd7c7139/33266359475.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/760d188f9d0154f93c5df06888a225bb/49985043996.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/supifa.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/94408619859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=insertar+pdf+en+excel+vbaPDF 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_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 10660 bytes
SHA-256: 55464a44ba07246b02c32d1d6b22f7094f7c705eceba13d885d80487c4d2bb06
font_01_sfnt_off00011488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9A 19824 bytes
SHA-256: 75800dfbda74d0aeaee1e45e933b8f0c322b5ccf01e787ba99f66ea196d4bd05

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