Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b3d5fbaba8b4f7…

MALICIOUS

PDF

87.0 KB Created: 2021-09-07 05:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e727e32e39731d8e7b375a4427998eb6 SHA-1: 59498013178b925c0b5f6a44793d1483d637b81d SHA-256: e0b3d5fbaba8b4f77a30a6f403d902654757c63f7136ab2fcacdafa88fabaae7
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://senhewood.com/d/files/20075832683.pdf In PDF document text
    • https://happycolaborativo.com/uploads/files/82510970651.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/wifekadugewumixekimigizu.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/21858866788.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/90714850301.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/vobamegutafabepexavime.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/joxuravakuzewelubowekuk.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/c7239af5ab2afeb8915684ffb0c94c33/mojononuf.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104d46a86eaf---87160125056.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/37279348181.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/50404477780.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e5169042b---94153526433.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/wufafeg.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/40348467568.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/sawuzedafaze.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/29361947355.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/95032633104.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/nukujumaborikupuwugininen.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/83236229150.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/lavugobifezezodawo.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/tadipero.pdfIn PDF document text
    • http://for284.org/clients/7/74/7452b259410349f427184d5eaa48bde7/File/87807299872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=july+2019+current+affairs+quiz+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_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 18632 bytes
SHA-256: 5c974d39aaea3aba0974b368ca1c5b520e453e486b06f9cc0ca1d1fc2d82bf43
font_01_sfnt_off00011b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 11364 bytes
SHA-256: 78eece510e29a8b04efb56d4c784246cc75ca0972bc576b7de40c86243f7b95b
font_02_sfnt_off0001362d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1