Malicious PDF — malware analysis report

Static analysis result for SHA-256 76293109e5afdd21…

MALICIOUS

PDF

73.0 KB Created: 2021-10-10 05:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7964a20a4fa9e65bc85769f855994604 SHA-1: 4afc25d2382059c9c048d5ba692b9f8bb22c2e1f SHA-256: 76293109e5afdd2140e6a52ed1f749dfb3388324600f221bcbb70f3cf3d1f848
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or manipulate search engine results. No scripts were extracted from this sample, but the presence of multiple suspicious URLs suggests a phishing or redirection attack.

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://soleilboo.com/images/uploads/files/77039508173.pdf In PDF document text
    • http://jtylek.pl/Upload/file/mulut.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdba43bc75---soposovajojokawefa.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1633638546.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/zepafubepo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8ddd4ff66f4e96fe50f908fcf570a984/virevutebodatuke.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/pinidifuba.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/fupefu.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/gusirodugibibaxawurumeni.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/sasudagugigifukapir.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/fokifixexipuwedivuligojul.pdfIn PDF document text
    • http://rinsacars.com/files/others/bekijolapojevonefajabuxir.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/tezipidotuputizupob.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b83f779a53---kirejofuwonojupa.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/pufexewupisiwifarojol.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/81323395239.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/fedifudewapuduxesakefewab.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fivaxosujagigekupa.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///74023778289.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/jujegonegafagiwemakupunaj.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/66d6246ab4b83fba82e447cb41bb15ed/57109477616.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/71075490309.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/kiketetedi.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441cb15f6b3---29025757370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=met+conjugation+frenchPDF 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_off0000bac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC1 16864 bytes
SHA-256: b5a59b5780271f8bb3ee00f7813baa147dd54bf440b77caf5abf82071d14c21b
font_01_sfnt_off0000e6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 10624 bytes
SHA-256: d8a5fd90088ef84ea5615698e2d2b76c032443bd1bca020427155767e04e60d0
font_02_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1