Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db1b3e3ecc08218…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 09:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b732a929d0336b4af429c1dc18bc853 SHA-1: f72749444713cf5d1085ae9bf999caa49bdbcb73 SHA-256: 9db1b3e3ecc08218a10752942e168943edb7883112e97447d82ad21242e85a97
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a redirection mechanism. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bba73164072---29925609262.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834b085857b---witemuvag.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0c0e97c5---godetimadisogi.pdf
    • http://stadion-zarya.ru/ckfinder/userfiles/files/bekenazoraxadinikovofibav.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608970851fbc6---bazirod.pdf
    • http://meble-tk.pl/userfiles/file/82519088953.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd2578994b---75844323295.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97abb91d5---mosinonipilofadujuxowazi.pdf
    • https://divinenine.net/userfiles/file/91806980554.pdf
    • https://lentes123.com/aym_image/files/54726212828.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/forakonenarupesuvulofuseb.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2e6ee12d50082cfed0b25908822fd4a/59452248589.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d983b5a24b---16539823284.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091234b22bf4---43842992920.pdf
    • http://mousike.it/img_ins/files/64893953767.pdf
    • https://besi.co/ckfinder/userfiles/files/maludarotufirezikakuwixi.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/2ljc7qv2klrsiaqfpmlprq61rg/20619056083.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22ccc097d---togixezanomap.pdf
    • http://fine-cottage.ru/userfiles/file/34923171748.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/69fda4eb054af1ea63e2937d7ec0de76/lozeponeluzu.pdf
    • https://adepotcustom.com/UploadFiles/file/20210428034632161.pdf
    • https://safrano.pl/userfiles/file/pafugibijozegepozaseze.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc486da71---javomarob.pdf
    • https://iqmuseum.mn/uploads/files/topevona.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/s95iegdhvnob7i2cie3rrtna80/kazezugunume.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/0816b17151692fbe84dcc3dc9b95d4c3/vevapunapesikinelixodonak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=burping+after+eating+bread
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebaa.bin
ac4551832cd52b5a63f3550081c1be63a23257ec151e4ad7137b61a2661344f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 10632 bytes
font_01_sfnt_off000103a7.bin
97be565ba5f18f82f8189d30210bf633bd129146b8d51da29e293ca0f35eebb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 16900 bytes
font_02_sfnt_off00012f65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F65 16792 bytes