Malicious PDF — malware analysis report

Static analysis result for SHA-256 236ed17357165228…

MALICIOUS

PDF

87.0 KB Created: 2021-07-25 15:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 78e8b8c81b06fe9b3fa1a0b2cc2e0d4f SHA-1: 08edfcaad2e9df365e80778aa904bc4b5dbd4d2a SHA-256: 236ed17357165228472c034db5be6919022577c6f1217a944b51edc2417a3060
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dralituncer.net/userfiles/file/vuguzajod.pdf In PDF document text
    • http://abworder.com/uploads/files/dojab.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b5b714ff492728bbc14848081ecd94f1/zuwelozemaronanal.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/40427876416.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/8becf5b59495284e80fa237307166c82/kamekaxaketotenokiz.pdfIn PDF document text
    • http://miracleschoolministries.com/survey/userfiles/files/24090494460.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608547a2aaeaa---84361897379.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768c22ac4d4---baguxotuwipas.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/tulelaxefuxogefimidure.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/perizanojipesupevexuz.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b9329cdd---rareravizoziz.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/newon.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///pojokajizufiruzowi.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/rutiziji.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b5e89cda7f83656658247786bf418cae/40364960439.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/72286804729.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/1sgcvk62bpsm0psuae71tlhod4/76837869093.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b20dd75dc56---99225400561.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/mezepera.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/924b3d95aac67238a3107646de92e4b1/6773423243.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/fs919qd9kirev9a5a9b0c0lt90/92267327306.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2db676220---wetesigojujexexiburi.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/45976770207.pdfIn PDF document text
    • http://ligneus.hu/upload/file/wipep.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/rivifeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=feliz+navidad+lyrics+in+englishPDF 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_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 19332 bytes
SHA-256: c795e3478fca1ef9df51a68bc3db55e0b293c953472d9d2758aec1b0cfea5a77
font_01_sfnt_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 10648 bytes
SHA-256: 31131effa265aec26a3639697698bb4a7874633281d8a97858c98e932ce91fb5
font_02_sfnt_off00013529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1