Malicious PDF — malware analysis report

Static analysis result for SHA-256 9657a2fde8237a2d…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 00:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9e4325f59b932362f63ae0b032367614 SHA-1: 3fad22925dcdcd733e5f511ac1245f2db5710968 SHA-256: 9657a2fde8237a2dd806200d7093d46f51e83bdbb6f37a829c304b566b1e8703
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The ML classifier also flagged the PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://bygreenpure.com/userfiles/file/lazixasuwuwuzezeja.pdf In PDF document text
    • http://makassitools.com/userfiles/file///jafibinigaposutedaja.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/83acf5e0e5276b0a75cbb30a270d9b57/soxirinu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac620bbde6---kuxupukebowobubajapuduseg.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f30cdd36cf0---pitizobetodulazubaku.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/nazutajerivit.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/376e8d5c712994dce64957acc6de7fc4/jumozarafifuzoweveb.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/77937807689.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf7aeaacfd---ditoneva.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/nidefuwow.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/92900287489.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d3bebd31b73f0c8cfa9fe5b115763267/74497799872.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/fafapevep.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17712b4cc---52414035023.pdfIn PDF document text
    • http://huiking.cn/uploads/file/05190732631.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/zitidapowag.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/9658550613.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607772aa2358a---88399342759.pdfIn PDF document text
    • http://talleresjpg.es/img/file/39571954234.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/nizake.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/80486766897.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9165960493.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/zoxazugevijuguluv.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/sozumumikoxowimetopuwima.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b74229d3510---56688724322.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/dazojepobol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=properties+of+chi+square+distribution+pdfPDF 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_off0000c262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC262 11056 bytes
SHA-256: 16cf9e41052500099937334585751f364352ab14d8f73f95fdce349f08ad39cb
font_01_sfnt_off0000dba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 19784 bytes
SHA-256: aef3c7c07e58611c92438eed66a66827db04e0b8dcd379f4369df68b926a5d1a
font_02_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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