Malicious PDF — malware analysis report

Static analysis result for SHA-256 2377b216c170c91a…

MALICIOUS

PDF

88.6 KB Created: 2021-09-05 13:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8efbd757ff278a0b7b8090c1942e7fea SHA-1: f299fa76c1465c53989a34adff6b7f4c6d565330 SHA-256: 2377b216c170c91a446ffa5ea7fe19b73cd5b8d1281aa016fd07695fed0e0ae8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609843aceeef5---50712468432.pdf In PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/48187353784.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/duwafozawuwuk.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/99mjop9bkuuse1lhagirkqd2f4/21122654630.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/vawumoluxadezoke.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/borejemowimeburutozapope.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56cfbd04db---gukepajarufen.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/17136293658.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/37134496061.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/34815068475.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/093a21o3dc67rruifl5mohcf64/kikoxevisumodefusana.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/fawanidawodopinin.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5636084566.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/76644457580.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/26341453540.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/17083186377.pdfIn PDF document text
    • http://4bx.pl/public/file/tazajupamosasawi.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/3b51e3c75db3f798de1f9bee52d8629a/toxozubuparesavo.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/41817950535.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b07cc3b0f---61274018637.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160df62a432f53---nutazaxojozedumigi.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/76979896258.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61c09bd939---77706870203.pdfIn PDF document text
    • http://canvangdientu.com/images/file/95848660965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=audi+a3+2008+workshop+manualPDF 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_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 19552 bytes
SHA-256: a95fd9ca9e9717086526cd190c64a4a0b5f6bd1ab5097ff55ee841c559a598e0
font_02_sfnt_off00013891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13891 11308 bytes
SHA-256: 918d3d0b20cb7fbafd7671eea20b019becaca97b621cf1e42946a89553e3dec2