Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f7b472df616923…

MALICIOUS

PDF

109.3 KB Created: 2021-09-05 16:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 330ba304aaf8124b0d049e92258f82f4 SHA-1: fa6a6fed373c6c4281134195e2ab039c19452243 SHA-256: c5f7b472df6169231d352778796204907c2fc99acdf39fc08cf3483d0d0ce46f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or redirect users. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading and executing additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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://taskentcompany.com/userfiles/file/88240890034.pdf In PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/wapilegufixo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e82db03a2cc---14854215465.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e71bbd16---levitivesixobinotoxivaf.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/lopobinunopulotonaz.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/50062954492.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/7659882236.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e34b183173---midujowa.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/797af481bb48283ad1b43e1f67a853d9/terifutowotixular.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1829024ac---54873090054.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/703734fdf0erevp5hj2b0o434l/jolexon.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/13100038207.pdfIn PDF document text
    • https://luminex.pl/upload/file/74189374391.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a629d283546---diduzepedojasinube.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608215db62921---vilewiburusuxademewawu.pdfIn PDF document text
    • https://gilbertems.com/videos/file/6144128061.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/36397195598.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/xetipan.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/58524202755.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610d587ab2a0e---89244032568.pdfIn PDF document text
    • https://ancoraeducacion.com/images/59496716608.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/92412864658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=storia+romana+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_off00014806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14806 10388 bytes
SHA-256: 6252d56b88cd040470bb336451830c37ebe29ac5f95750d8c7b045f8dce1ec4b
font_01_sfnt_off00015f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F74 18144 bytes
SHA-256: 9857b304b05ab64333f9657d2bc43ef299468874f935c71bbf8cb3f51c1ec0c2
font_02_sfnt_off00018f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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