Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd901e06e01960c…

MALICIOUS

PDF

87.4 KB Created: 2021-08-09 16:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f6b91ae2e3ec1695b691c99ca720cb2b SHA-1: 9cf33160820d8691a9602dbcbda4d9d7bb96def8 SHA-256: 5cd901e06e01960cadc63715104b91aa62d9384fef5c38a990d020d94d9db4c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b076c76af5---84266937227.pdf In PDF document text
    • http://lukasikgroup.pl/Image/files/92827659014.pdfIn PDF document text
    • http://polletnv.be/uploads/files/labidebewa.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/94966947815.pdfIn PDF document text
    • http://digifast.cz/userfiles/fepan.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/18121197714.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/xenemipemubonobozorezo.pdfIn PDF document text
    • http://newmob.it/userfiles/files/wifuvuvig.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b607f869d7d711fa0fd4f9c64df106de/gebizo.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/tefubelad.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/pupobagifomasusoror.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/42967285408.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160865bf6ba188---32916113168.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/njg8p142psa7c5jgk78b84ck0e/47794274486.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a4455e6fe49e63e985364ce34628264/nuditipilesires.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/77475484731.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/4580769713.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/1241s32kgshbmgif0mic66na14/64943994132.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/raxepu.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/78348936485.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/desaxogelojiribobujisi.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b47cc3a21bcd1c727ac3baf86560bb6d/jebojezenizi.pdfIn PDF document text
    • https://retta-bg.com/userfiles/jagodugini.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/g6t0d3qrtc2sm2hh64b2im2f55/xenaxufuvisefojajuwux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=does+arby%27s+have+gluten+free+wrapsPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/49286182207.pdfIn PDF document text
    • 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_off0000ef28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF28 18108 bytes
SHA-256: 71ed3c5b03fee04231c58bf1dfb6bfae0d2967ae5be38448c3fdaacd2c84f348
font_01_sfnt_off00011e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E20 11084 bytes
SHA-256: 786822eef5a035e2e84cf7832cd99726d0fc2052671799c6d16b12d52edd2374
font_02_sfnt_off000137e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1