Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8f388775059fba…

MALICIOUS

PDF

88.9 KB Created: 2021-09-07 18:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d40847fb3b0e17ea0a3bda4f4f95018 SHA-1: 7fb229e823f29be052ea1048b3a89525f37f1f86 SHA-256: 5f8f388775059fba199fa3457f7f0088be4fff98899527487a0f7b1010e6aff0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. The document body was unreadable, but the presence of numerous external URLs, many hosted on potentially compromised or low-reputation domains, strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medical-1669.com/userfiles/files/kereboriwogir.pdf In PDF document text
    • http://vit-physio.de/file/kufuvere.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081bdffc77b2---lesirimubopexibesa.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/cf4c9d2f9c6b7f162db135d0066d7683/karom.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/bexoboxuzepepubogosapori.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/97b35d941804eefe896278c6a0a56ae5/49140373631.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/83nu57t7qn8bs6h59872256vq4/16162451845.pdfIn PDF document text
    • http://berbun.com/user_img/file/xenifopudonizivisur.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/vutilegizakileledijekifix.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3adc5c94---votuxegazupa.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/50013481308.pdfIn PDF document text
    • http://texmet.pl/userimages/file/rafunemu.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1329506712.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/watumamadorekufuz.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/032acbac71b87fa3e138825e1d34b7f5/vufofilojikalosenuredof.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/43971118243.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/mak3l1gttig37emjmdju9tu6eq/64517482913.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f32b1632a---90070114156.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/66503971694.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/70105784944.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/34054550051.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/fizetu.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/wizisiz.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/xeraniwobenasixufinaf.pdfIn PDF document text
    • http://workontext.ru/media/file/84115766928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=acidosis+respiratoria+aguda+y+cronica+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_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 17360 bytes
SHA-256: 5e5fc01b108154b1c77404243226ba2f21e9b96c4f2198335cee8637a0dba908
font_01_sfnt_off00012407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12407 10944 bytes
SHA-256: f96baa96aa1414922f9014a2a9e7fa641f58cd13fc6789aad640346720473244
font_02_sfnt_off00013d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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