Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17e433a5d583f5d…

MALICIOUS

PDF

84.1 KB Created: 2021-10-06 12:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6f81744238b04fa2ed820f77cd2adc18 SHA-1: 38e011995da26e292afb28e7cae4ef02c4e5701b SHA-256: c17e433a5d583f5dd0965ab5c1c858d64d4f9bc691a9a0742677eb4b207f19a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://occahomesearch.com/userfiles/files/xekomuvurogute.pdf In PDF document text
    • https://cochleartudaskozpont.hu/files/legomikiwiwubetexu.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/84964519983.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/bamonuroxogiwikawumurik.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/kotofekasivasexidalujibi.pdfIn PDF document text
    • https://carlock.hu/ckfinder/userfiles/files/mimibeveze.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/fisipaf.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/xukavanuzepozikiwubobip.pdfIn PDF document text
    • https://angkalaris.com/contents/files/jarasudenepifu.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/7588233522.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210905_D90697DF728A336B.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/xadasurad.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614a11cfbbe9e---74897042239.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/k0cgjadq60t87stfo951emhdrdc13ckh/zitiximig.pdfIn PDF document text
    • http://www.heksan.com.pl/file/warugufef.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/telogajazeragiwakuponawe.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/27688560130.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138aa08a0e5b---fipuw.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/87022294991.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/7015528656.pdfIn PDF document text
    • https://mk-pamyat.kz/uploads/files/33649472137.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/duzutosidewepedibufimuw.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/mn6ekgfk237kbo8khaphdloaks/bewuginerorub.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/31263352321.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/8895160565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=drawing+an+ogivePDF 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_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 10124 bytes
SHA-256: c10038dda7b770ee99efa58f5c796146af05b23032ff367ca4678c73c8fe6b7d
font_02_sfnt_off000111f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F4 19048 bytes
SHA-256: b813cbaa150538b7803bfe3590bc734ad1151c0ecec863c06309051d6aa64a88