Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa93ef3f8368bde0…

MALICIOUS

PDF

89.6 KB Created: 2021-07-07 00:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7486c8fe349204922bbe9511dc8833f9 SHA-1: 11e36fc0fa5b2a2ac93f905a6ab67a56949ae6cf SHA-256: fa93ef3f8368bde0a822535864651d193ba4fb6e48a73f463e8042f814dc5f25
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://whewfamily.com/clients/12004/File/vedufatigajiwekasat.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c60297a427b---71140256688.pdfIn PDF document text
    • https://arerp.kr/data/file///topilagateluguwilebit.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/64029035034.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608848a16895b---94561044137.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/kibekumagivofaluxufegigoz.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/bupisoxumabe.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/pulet.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/9174618777.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/6554d7f835425ff54e83aa8e8d43fce6/jegofamod.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6a39c1669---10123539768.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b474cb73346---24455297487.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/butolisenolup.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94677bb396---jupifepakif.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c67a2abbc3---rerufigamaterov.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a519fa2e62d---sasufu.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/pubepuwutirusow.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210601/file/16225168771662.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/96719826685.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/96519690720.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098841f4aef2---52635039032.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e16a0adf---weweliw.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/kixerolusopo.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/nirelojisejibin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=my+sister+birthday+wishes+tamilPDF 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_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 10624 bytes
SHA-256: aa2495832c471eb5ac8202ac56e0fa9896fd096fc743278d7b7fefe4483e968a
font_01_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B04 17524 bytes
SHA-256: 96aa304ba54c17f186c077f48e5a4e603adc66c72b3ff1f806f518e96ea0c5a1

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