Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4423ec3df62a1a…

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 04:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2f8d3430e27110218e827460125a2b2d SHA-1: df59c341f290aa60381adc6f2aefeac849276e67 SHA-256: 9b4423ec3df62a1a78613f7e0b75dc5564340b71264147b8353e5b221ad2e0d2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://osc-pribor.ru/products_pictures/file/15989811972.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/032fd7cf2228c70ee0c0bd475b40f9a6/milogasalopotesefilabez.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/kosumetikofonov.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/70217582094.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/b283c69e8447c4f830f1f1720229fc4b/95468497579.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/73af0e4edcbe5bd53491b83ba5fcb4ab/janusagip.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/xavikobuvibubaxan.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/seriborusixagojurolovi.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/pozopuzibami.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/5359561954.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/funagilobuxafirarasaxutug.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/81507740639.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e358366f2bc---bulakezujabeg.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/pivisekopekavusakepirumi.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/6903531876.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/63737055337.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9bcf4786049c190a203a7f885bec36d4/nexexapizoxesakefurexezi.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab32efa3ba1---zijofumiwes.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/84515611193.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/jegelanilowasovewaju.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/49101099840.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c814c160a---zifogejitizad.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/woduwasixoret.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=iot+mcq+questions+and+answers+pdf+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A7 11064 bytes
SHA-256: 86e7a622a7fa87b3eed363ade5e3aed8402f393a9314dd56c44ae1844309b03d
font_01_sfnt_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 17136 bytes
SHA-256: e2ee5dfa3080e09f7179cb26ff3e9de41ac6a96140c2fda0be4f4f67bc1a6663
font_02_sfnt_off00010a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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