Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb1c0774bdf3f2e…

MALICIOUS

PDF

67.8 KB Created: 2021-09-13 19:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: cbad717002b159fcc55d184bbb96bfb2 SHA-1: b2d2d56ff3b9d9b6d06e79db7d7ceb036970dcb8 SHA-256: 8fb1c0774bdf3f2eaf975b420a16223ffc9c19cb6af5bb357c9d94228e825fc0
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 large number of external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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 https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2275dab6c---tedububaluwovux.pdf In PDF document text
    • http://medi-sen.com/files/files/somobewexezapurijo.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/52444947856.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/1290977421.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/33889413361.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/17e625076f143d2c896d8120bff9d708/kaxusulujegawomazade.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e4800eab5---sidozobapexegoxeka.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5mdqs6t4lqmdq8qp2di3oaegd2/88244219360.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161396dcd9883c---19368548861.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/51841894945.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/zodukuno.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/dafese.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/24279811384.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/gogaluwavofumejikelozifa.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/10866946149.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/39377165371.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/tipomizog.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/7196284456.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/43389117331.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/98073298840.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/70548955339.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/84011933182.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/gujuvos.pdfIn PDF document text
    • https://steammining.com/userfiles/file/36000043421.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/13128429596.pdfIn PDF document text
    • https://mahae.hu/files/files/sirawokomidej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=d%26d+3.5+stormwrackPDF 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_off0000b34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34D 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000c5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EE 14584 bytes
SHA-256: 98f238f406f07d4528b1ba185bed3bcde8b64136c35b420de9849731c6796031
font_02_sfnt_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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