Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e1fd2da35a4a3e…

MALICIOUS

PDF

81.3 KB Created: 2021-06-12 21:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 10d7e1be9a4e7f0907dd2272227df683 SHA-1: 75fbbaa30cf1897283825f5af53eb439aaebed72 SHA-256: 20e1fd2da35a4a3e01f79e6a3c3adbb6a84c3a19c0c8ada5d60eef53edb663a9
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites, indicating a link farm or phishing lure. The presence of external URIs and compromised CMS upload links suggests an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/uplcv?utm_term=super+smash+bros+ultimate+all+spirits+list PDF link annotation
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/520b7d47c3a10c7b0c4d2a9b50b13bec/65377574698.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bqf1g5nnu378gi2anhd8upcj74/kivuxijod.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/039fd6a2b99b7095b87bf8736b355e60/51139248727.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/kut0vo7tao9lrd6bncnmm6mmcg/gebex.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbff8957fa6---36822249064.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jlu2eeu0n471b1260u9sa2on90/70448964133.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bce90307976---92741625596.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3c8a26bc4---vanewusedasawemaxutu.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/9tg54nffbjgfa9p5o7re09nh0h/fenug.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/88edc263ef3a421c891c7d569dc55a19/bogorubigerewumik.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9463e6d9604a2909911bb37ca7a6b86/xunevirawuwawegonu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/87r7it10rkg4nc4nc5qaohlca4/29972937895.pdfIn PDF document text
    • http://ahchala.com/img/file/8260428229.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8a71b038f6bddae69a6a6050d7eb1643/18063555239.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/4b6bd7f8e811a7f10866fb5a807c7cc1/wolirapisevomaxebaz.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/p5fjikkujb65lsld2mctp5vv1l/61942221403.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/petanokijanonezadejonekak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 5080 bytes
SHA-256: 158c55d3e9cb7cee67bb17785e8bb03cbee970007af306ab5d7028c5ea611c3d
font_01_sfnt_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 10108 bytes
SHA-256: 7db520be633e5896d88d1500b72bf25e6b5aaf65a416b638a95ab97397638c77
font_02_sfnt_off000129cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CB 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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