Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b9a86df1983cc6…

MALICIOUS

PDF

72.6 KB Created: 2021-09-12 01:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c51ff9f1fcdf02c351dbd4a23e8e3312 SHA-1: 0931d9dff5eb5c8c35f89c5dc38229fbf3e31411 SHA-256: 33b9a86df1983cc6a37dbe8e08f7d568626dd1179410ac299c5c2ca099bd1aba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure or a downloader.

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://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b1b1347a---96995618874.pdf In PDF document text
    • http://centrons.com/uploaded/file/1369106004613cb812a4a87.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109060252253770.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/52783681814.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/rapulafemowomiz.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/duguwez.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/bogevuporikitiz.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/84675764097.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/zoxajuzakemapanixagus.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/sijusizonagesemunezejat.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/84933496962.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/64721362669.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8690628e27b3c01b7c2007b71ecbc0d/54903816547.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/96379836468.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/80461478559.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109021328594372.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba9c1a889---piralurekani.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/91989971889.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613557f9eccca---mimux.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/24277621593.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/toborelawazobizumavu.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/66632104134.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/memumuxetolujos.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/42424873417.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/logesujozixit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=strongest+part+of+the+bodyPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/manidurekawijosapojedav.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_off0000ba62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA62 10968 bytes
SHA-256: c08cd20c5f8992567a2ade6ca0a0fbffd944a9416d7a2fdb590d0eed0c5a12af
font_01_sfnt_off0000d356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD356 16348 bytes
SHA-256: c8bed27a11d3ea3f93c0b9e66791761511d8089b2afde95ed4842557241a811c
font_02_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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