Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b72d6b70d69eaa3…

MALICIOUS

PDF

86.6 KB Created: 2021-09-06 06:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c1364501b6c1e74f3fd0745da0ce31d SHA-1: d99e4cee96fcb72cf27d03d33d1a35a684d4cf68 SHA-256: 0b72d6b70d69eaa3aded785c97a8668672d59f9756d71e751d9cb971966adb71
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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 http://www.hausbaumesse.at/ckfinder/userfiles/files/rubasiziwilusaxozebuxuk.pdf In PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb4a88f2db---87187792994.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/migunefiniwarogivemev.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a2ee1acc---26359768437.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/8282844220.pdfIn PDF document text
    • https://petikdaun.com/contents//files/11658354514.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f0f5f4ddfdbf0662104f21c392cd58d8/21304417206.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/96956431791.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/lejabinu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/3nt2h1johcbijqrir7o2qnlfp4/21614174070.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706668874fb---pukuratedife.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/wufadatiramidipalu.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/44835574390.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/aaf83a34df4f2c285cd7313707c71ace/38852779943.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/52eb3a434b7822236c6f3146dff27625/37144683038.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da62c1944e---20604101833.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/pt8tsllg80qj3pc2kg9o4ve60j/22220242489.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9a521dba9---29746573032.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/66255659494.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a864c2fb9---57102953732.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/30819007988.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/satugozaxunavered.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f976d0f990---22088720185.pdfIn PDF document text
    • https://giustofiori.it/file/20920827275.pdfIn PDF document text
    • http://livilgirls.com/files/bikomajarojulanedugof.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/94139504451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=introduction+to+law+for+paralegals+6th+edition+pdf+free+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 11204 bytes
SHA-256: 070b4ee63d28d5891090274f08784884f30a2620e05b84f28d3bfaef7442137d
font_01_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 17668 bytes
SHA-256: 918fbc08ebc4279e6f0724aa48dcea984bd2944985b77273e626ab08718e6147