Malicious PDF — malware analysis report

Static analysis result for SHA-256 10bbe14afab763fb…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 16:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7b590c448a18726127c44a90afee863f SHA-1: 1298c3108c6b80e03ba2ec14dfa1ca78cfe9d004 SHA-256: 10bbe14afab763fb1bd8e30661399081eb36941582e880e7b46c08f69906d77c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary purpose appears to be directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://espacioschillout.es/images/admin/file/fejikisilop.pdf In PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/23386699008.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad718822294---45124005898.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0f7b3bc8c---viselezakomelepu.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/winuzawapudadozagegig.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102538096b7c---vegazokomumaji.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c62a259bab---rirojakutemofoxo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073535faa1f2---kanidi.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/3280034361.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/jawobamuxo.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/82ubkbup1r8ufs1vlbiot1m8fa/44799143750.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/fajuxosomaguvewup.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/4f2be7e5e820a32008fb2c2d4b4824ff/6149446560.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/7628897032.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/vqlbu78kdfkp8okndptgjsro15/fagefuvovilijob.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085658c1298f---litelodejate.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/55ce4f5bd8af9f8d1263b508ab17f3d0/lajanifu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c31875a94700b88e50776e5c13822e44/fumibupinetup.pdfIn PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/letejokipujeponaw.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/depubunijasu.pdfIn PDF document text
    • http://dzbnf.com/upload/file///90901876574.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9m0niknad4k5vkaj1nu98grs96/96575357733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=four+year+old+developmentPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/denumuw.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_off0000dd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 10552 bytes
SHA-256: 16b9ec33b48a4d1b44dac1fd6f760e391b5bfe73db208c17361c1f66e92e01a4
font_01_sfnt_off0000f52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 17872 bytes
SHA-256: ee9cc305ebede0eb9a67d028f093ae9dd610d1982f20f2c54150ba0921a21157
font_02_sfnt_off000122a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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