Malicious PDF — malware analysis report

Static analysis result for SHA-256 59eac775ec313213…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 23:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d5ba298680460880d2ea9e99f27ddc5 SHA-1: 6be98b0fed07e8dbaf3b75780bffa7b3e1d9cbc0 SHA-256: 59eac775ec31321378dda8cd97f29f3dad6b2482d932b1d89c5b2fc0582fa97d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e3978a741---85262565264.pdf In PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/luselonisunaje.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/teforopolurorenij.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/nedisurodofalogarewu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tbs4k0tv391gendv7qamq44uch/vatiwidukinonap.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/85092656688.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/roboxakifolajironakonu.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/javagopamewomekalabele.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/tozixuzokesodipe.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/76971959519.pdfIn PDF document text
    • http://all-premium.com/user_file/files/54437868603.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/65997759145.pdfIn PDF document text
    • http://climtech.com/files/files/begebajenezamidita.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/88260375282.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/57754159498.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/18763173510.pdfIn PDF document text
    • http://chengzechem.com/upload/files/zumeguganofisuxida.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/21974608761.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/dofigerikasolanexutudime.pdfIn PDF document text
    • http://reylab.com/userfiles/file/demonulevukiseramivop.pdfIn PDF document text
    • https://htchninc.com/d/files/lonijavinosopesojawefa.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7bfaaf91c---23502044402.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/87427871148.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/poia00uhl0m558cf2ln5gksjs7/9756304234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=evil+come+evil+goPDF 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_off0000bf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8C 9988 bytes
SHA-256: 78b94bd4718c2b100d6832da168f564f41c37f3e7a6760c0ec228d65eb4c7b68
font_01_sfnt_off0000d5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 19956 bytes
SHA-256: 36a8a4560ede51598ae2f4a5b3a5ce7f3c17841560282c3902134c3475134464
font_02_sfnt_off000109a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1