Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c763cb44dcd2db…

MALICIOUS

PDF

108.2 KB Created: 2021-09-02 12:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 21bee1accce34b302534f6de1ae702df SHA-1: efc69f1c91d7c50b79b610ecc202a58540f753a1 SHA-256: c4c763cb44dcd2db9943c2ae855dde0e811f5932abbab35f6749670c5066fdfb
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS platforms. These links are likely intended to redirect users to malicious websites for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=healthy+unhealthy+habits+worksheet PDF link annotation
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8ac8a61eb---wawujuj.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/bupakiseli.pdfIn PDF document text
    • http://df-foundry.net/d/files/45589665864.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98f4adee2a.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/94925775674.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/54df346abad2ae82aac360cbe5a2f010/43259833872.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9f3ae7cc4a442cf8a589de132527e64/lakolokefabemogovifim.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/19538381142.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/58553805944.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/87012117872.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/diguwojuxabupa.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/40656993380.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-8-6/20210806224154365229.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1rqbtp68qojo86iql3ag643282/55346974187.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/92383ea2c2b52d6b3ebdec4229825d82/48460714612.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/vikekubukaxojowolu.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/28055900650.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde563f1b5---lalavodanax.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/adm72bv5763i71fjcu5kvdvo54/damigowudelogarikijed.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/pinewunorolakanuv.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210811002022.pdfIn PDF document text
    • https://sanidom.pl/img/file/vakutulu.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/64666819068.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608899c06a3de---3670886024.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_off000140b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B1 19260 bytes
SHA-256: d4cbea61265227d5f273cc8469e6d3c5302e89e52d4a744321ab5e4ff51c2b15
font_01_sfnt_off00017239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17239 10728 bytes
SHA-256: 98e2d1af2b3ce60c99498a834e4031e121f5a4a88674ca17fb0cd3981b1c7b88
font_02_sfnt_off00018adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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