Malicious PDF — malware analysis report

Static analysis result for SHA-256 04941fc06c064b19…

MALICIOUS

PDF

85.2 KB Created: 2021-09-08 22:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f18bfd5d571154c5964fb50b5240749 SHA-1: 4d6f9c411c0074b626b2e635779dfab7f01e38d6 SHA-256: 04941fc06c064b199b2a37874a20334ab43267a5ab1217f305fa2d6d1a1d912c
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://trompis-tondschungel.de/userfiles/file/16082848446.pdf In PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/koladomixedaz.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/81363437211.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/10470662356.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/33735865231.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/78438624775.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/xinotukuvat.pdfIn PDF document text
    • http://wdnederland.nl/file/numarusuzisus.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/wodegupojitirupoka.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/pinoxurubaw.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/72641305623.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/91075656810.pdfIn PDF document text
    • https://jagominum.com/contents/files/zupit.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134fc980469c---77151723031.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/vajade.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/92341226168.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021921547507715.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/22255416460.pdfIn PDF document text
    • https://synersys.fr/contenu/file/19631067004.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/biwuwokinuzifinugitinus.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613833678ea0d---kibatugodepikukefonewegel.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/sobuvilojuxarigove.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/490dde1d2e7271aebeeec5c43422bccc/welozifusagagajajasu.pdfIn PDF document text
    • http://hodori247.com/uploads/files/10135341304.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328ab2b10a9---72733680324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=aplikasi+untuk+nonton+tv+di+hp+androidPDF 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_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 16616 bytes
SHA-256: 6957b4e083f9d16a6ac07ac273b42fae98aba706e3fd634bf7b89bed92528e30
font_01_sfnt_off00011720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11720 10596 bytes
SHA-256: 33b84876f836419524bbfcb606c050786f4f20e7d9cc43d2adb79fbee81fb948
font_02_sfnt_off00012f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1