Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ec7dc6bce93ac9…

MALICIOUS

PDF

72.5 KB Created: 2021-06-26 05:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a13fab2331d55e9387611a3388537b7d SHA-1: 3e3a826a977f7f0c16a9f503323e38785b82bd05 SHA-256: 80ec7dc6bce93ac9c073ca3211d333d956b1bd93684c3f72337258131b04df0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack, likely intended to lure users into downloading further malicious content or to phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b86bcb15848060d109f79f16c63c9cd6/nodafibovo.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/dae49619ae506b00ff5cb2c7e867233a/47755868916.pdf
    • https://luathoanghuy.com/uploads/files/kuzulikevakasidif.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854d4ae2420---vikuvuke.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/vkt53eodva32d5euruloql59mh/wolidebofugakakumafewawe.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/mlp244kvpl0ef14apu24ufg8h7/22704649820.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ec7f4708252967ea281254a0e26fae06/88815605422.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/e9dcadf02b41a12d7c89a7eff9c3c4a2/wukukenobukodixaxu.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b352ae178f---luvazasagukota.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2af69a2d1064e41909d06994ea1e1831/mosuk.pdf
    • http://georgekoldun.com/var/upload/file/jukutopudupixonuta.pdf
    • https://steammining.com/userfiles/file/61320886982.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7625eb5b6f---42186118061.pdf
    • http://namuvaldymas.lt/userfiles/file/goxuloxagimomenatexisuwi.pdf
    • http://resetimpianti.it/reset/public/file/desejixub.pdf
    • http://yacpa.org/yacpafiles/file/feturunogametem.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ab220dcbf---72573704152.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vt6k1u1d8scv9moc7ihop2pr7l/63832324843.pdf
    • http://alimentosldm.com/userfiles/file/refizixoxotojapevotumuz.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/add124bbb5d109384f45faf5e7ba5e20/83782967990.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/2b08jk072j3qtl1h5kbuadqo2i/19946578393.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/42972642174.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/33581673396.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=scary+stories+torrent
    • 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_off0000ba9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9B 16792 bytes
font_01_sfnt_off0000d2b2.bin
d55a906d1dabf9e9ae8f975f00107fd720a5f2e21771b36db8d2c35cdf7d37cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B2 10364 bytes
font_02_sfnt_off0000ea41.bin
078f18e1b62c7a5527119a4e19f14fb6750fde2dbf265d548f1911a331f57d17
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 16428 bytes