Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7afb2fb55175c6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 22:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 787c77d32dc34814773468708c8908f6 SHA-1: 6216277aa029c10fd15d1b812b5315e2acca06e0 SHA-256: eb7afb2fb55175c6b38e57a602b0370f795ec57fe0d034ecabed5fa0b24c9308
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://integrotech.com/zdjecia/file/tugenorozuzapopodopujuxo.pdf In PDF document text
    • http://ecme.site/2015/vat/upload/files/85040669518.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/56565784026.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/6f595ec375e8ad7eda747059c67037aa/lirugadadoxow.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/tedek.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/57153576329.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146495cc5a3e---vovowavesowebazefod.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/19385905415.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/maxadalusewubaduxarotokid.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/gusijugawuzonorodu.pdfIn PDF document text
    • https://tipresentoio.it/images/file/74585126159.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/nekikolukonereb.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/93294310438.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/zosidozolokepaxobivogo.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/26409192945.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dfe46a77fbd4310fc7cade77037244e9/59538008602.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/h5dbg6n7nm6l4mb4cbcqgo67na/40616152978.pdfIn PDF document text
    • http://chromoink.com/updates/file/35670259713.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/wisawinajazelusafawel.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/folotovasonopo.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/zulamovokalubenadonoluxe.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/41bb4a4e0853429dd21a85ece2b51b8f/13546142613.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/wizupidipitugufenekojena.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/59980277519.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/10872574932.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613909b340074---51914647554.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305448e141c---4073232920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+uninstall+lock+screen+appPDF 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_off0000d512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 17584 bytes
SHA-256: 8b3004a31494766317ba4c8c0c56bd0753f2b879ebde9c9d99ec38dde41a0e78
font_02_sfnt_off00011abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABB 10636 bytes
SHA-256: 667ba5b6ea434633d49f2ea96e1d49bf8c14ff8684cd32fdf78dcb5fc7483c16