Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2f0497dcf6cb51…

MALICIOUS

PDF

101.9 KB Created: 2021-09-12 01:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3bbb01b33b657daa3c716fc37e8fdaf9 SHA-1: 214b251ab6d79a0494af11c7a72e7d83ce512adb SHA-256: 3b2f0497dcf6cb51d7eacd110b9e07b961fc6d7ce5aa870adf7fd8c7ff6072b5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating it functions as a link farm. The embedded URLs are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://datcat.vn/2018/file/84993317300.pdf In PDF document text
    • https://maconlux.ovh/userfiles/files/fudatujolijexukena.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210902142609_cm7jol.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130041d936d1---vuxevasumeseludefox.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84422142777.pdfIn PDF document text
    • http://goldmustang.ru/files/files/15399325516.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38795544896.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/zolepajobux.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d232575e10---wirubonad.pdfIn PDF document text
    • http://chamdure.com/DATA/files/titiditiwobidereso.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///38176209183.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/balezegigex.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/62875669622.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161376759034dc---bajasomovopuvibivufokejo.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/noretire.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/77626142798.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/ralirukelinotafog.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/sos1f9402s1bjpdq9cdph5deif/78809584445.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/nemexipaka.pdfIn PDF document text
    • http://fourfoods.com/images/files/zatezarejuletun.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/sefaxazozusimotinudufawad.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/fudise.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/50986167611.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e297bbd33---ligarorurupupegolofajopog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=stock+rom+download+for+samsung+grand+prime+plusPDF 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_off00012755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12755 18268 bytes
SHA-256: a52194e03466337b26a5e76163c83dce587f926eafa6916aac9487b50193e1fb
font_01_sfnt_off00015696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15696 11316 bytes
SHA-256: 49594e086c176542a481cd2246e11facaba59dfcc06c0c89ce3814520369d025
font_02_sfnt_off0001710c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1710C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1