Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b904735284d584…

MALICIOUS

PDF

77.5 KB Created: 2021-09-02 04:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: daa6747dad1140b62722630e91439bd0 SHA-1: 4e4200177f79e443521eab219d920fec9c7760d3 SHA-256: f3b904735284d58436c4fad689456ba387d13e8b109183d7d23431b536f77bab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it may attempt to exploit vulnerabilities or redirect users. The PDF also includes numerous external links, many pointing to compromised CMS upload directories or disposable hosting, which are commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/vopikodu.pdf In PDF document text
    • http://rucodelniza.ru/userfiles/file/napivijopofavin.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/24922793967.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9221b37217---56215690863.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84274346805.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/f9j7t3otmf2o8o6ar0frtd5s5j/witutifafuzazoxuvati.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/rozufomaxopoxaxibazek.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/39653994093.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/92823388767.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/684d41de944d0bfb68024345e84ae544/gojuwikarovisimobudif.pdfIn PDF document text
    • http://falconltd.pl/cache/file/77347955738.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099cf9abf421---18054282560.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866922948c0---96888780697.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/562a948b79c82f2a1842293591748ac4/vabedewefadure.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/d8bdff8fa6235205e1f82c9d726a10b5/fijedepo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a651a5c817---41400893983.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a5ac99bd233a36f9efba1819100d7ba6/xiretipo.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090bb87af023---38548090270.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/0ea89804578b0666d4091fc689aedc96/58780314725.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/15461184923.pdfIn PDF document text
    • http://tannhatviet.vn/upload/files/2003244500.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98648038378.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/54712224636.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/28490368916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+meek+in+the+biblePDF 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_off0000cbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEF 10020 bytes
SHA-256: ea232b7e9168f693cc4855bdf91a4ca8c5264173e41248f856c9b5b132b0a8ec
font_01_sfnt_off0000e1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E2 17292 bytes
SHA-256: c2d0e871c53842dafe2c2e84ed19f2224453e4e0cc5d71e420936e488aa7cf83
font_02_sfnt_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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