Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc055505dfd9130b…

MALICIOUS

PDF

76.3 KB Created: 2021-07-03 22:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6346f515368429061802339a18798161 SHA-1: 45478457b8161dfad19813e3db71932562489b34 SHA-256: bc055505dfd9130bcc28c94618f70d28f51effbdad8ea9d2b945c872ecf34c89
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, a common tactic for distributing malicious content or phishing pages. ClamAV detection and ML classification strongly indicate malicious intent. No scripts were extracted, but the structure and URL targets are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46bbd58dbe---geluxekevi.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3614936ab---gumijimimakitagemidag.pdf
    • http://solamsys.com/userData/board/file/18672550891.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/99473538904.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a3cfbde71---84860449966.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8370c38a1f1e8311950d69a59ea62d5b/96870422270.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b91c0327977---modulidebaguninipokugaze.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/056160294c0f93652bfa3aa5941baaf9/92022927241.pdf
    • https://peilimineko.com/userfiles/file/6051959840.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9efbbe1c---fudapat.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160926cb604e35---zasedumaroropeka.pdf
    • http://byty-pardubice.eu/UserFiles/File/motelekejaradegupenuvalud.pdf
    • https://basalyemek.com/ckfinder/userfiles/files/bugapaz.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d164be0c8---86991785769.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e10df817a0---xawizewewotejax.pdf
    • https://iringmalaysia.com/ckfinder/userfiles/files/80001548557.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ubc9tlhugq3igag9lg78h921b4/41623186273.pdf
    • http://harekatmemuru.com/images/Media/files/bexubux.pdf
    • https://alrukn.co/userfiles/files/68652878328.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a0d13f9718a2b696813b6c44e5d6fafa/tafuvexavogobaguj.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16093b60448038---38456815177.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/88168608160.pdf
    • http://fujavietnam.com/images/Download/39428020987.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add3c927273---19083578506.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/38950430828.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=weight+of+gold+coin+5e
    • 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_off0000ca1f.bin
12cab5c795c80f58bc55e5bb0fd83197dc36cc4f4cdb773c449f13c385e98a01
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1F 16288 bytes
font_01_sfnt_off0000f44f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 16792 bytes
font_02_sfnt_off00010c66.bin
bdfe59d63d55a096314da4a49f67d9a7796860e3f70ea2eac6415afd5c009705
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 10452 bytes