Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0912f5c37c6223b…

MALICIOUS

PDF

111.0 KB Created: 2021-06-28 20:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 21f1715e3374236ace5b113fd83d9bcf SHA-1: b6fa819f8cb9871a07ab7c02955761cf576e3dc8 SHA-256: f0912f5c37c6223bef72b74a9368cb7074481aeef97fe82e7d475fd9f337fd85
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of multiple distinct hosts and a high number of links per host further supports this. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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 https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/77adfc5c5ef3c4d9f7df1146500e820c/66897173717.pdf In PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/e651c53cce7586e3273621b0c3f242cf/43584769997.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7bdefc3588195a4c491d86f4af7788e6/buxuxaxujepisat.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/58v7j0fj5qdbjriue9m2d4sars/mosaragivezi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d92376157a5---98978835220.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/midorojamujefawulokibo.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf04d66d15a---tusamugewapapa.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e9b721a5---jefekuzitenizikuradugup.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/39713770288.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/77234739135.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/8vl465cf4de6mi031er1m0tg38/bonalejivomuxi.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/37280625992.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/dumavapopuzekokoj.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/qfecotcjvvsc7esjjomq7243rq/navotenufaju.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c272b16a5f5---19909770098.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076bb8c0a65d---2927143789.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2jqk98d4rtoka9nqt416clln67/lagetufisi.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/05ff29c4a6a8c88f92fbdda43b75c8f6/64522363398.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/soxuvene.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e8a44b75---57777436927.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/51424360714.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/90193014556.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/okol4ln6np4j4e0cu0m33g9ojd/49722907010.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/gumokoiaa0c66pcetjeihvpfaf/80106477948.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/bv000vt9cj1tg72qdmqa4akb96/11584474455.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/chgj1tjp7r4oaibdinlimkp5qt/pazamofowamavagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=3d+modeling+and+renderingPDF 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_off000151a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A7 10400 bytes
SHA-256: 96e4dc3b0fc709870fae7b0bb72d41fb520593e47837114b2d382b8c742265cd
font_01_sfnt_off000168d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168D4 17400 bytes
SHA-256: 53e8b17f73b64fbc9133042d691160affa109d82003367e9c2d5edeb11ab34ca
font_02_sfnt_off000196ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1