Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d80a39e8e0c08a…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 14:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 339ba0185f2876c660c1014b72bd84bd SHA-1: 4904d794e55b20d0c480ea1c91982e379f44180a SHA-256: f7d80a39e8e0c08ad6bddc193724b94134333ac5c2163a8093268b449affc9c1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous unknown URLs suggests a redirection or download mechanism, likely for a secondary payload or phishing content.

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 http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f9f13932f---51899112486.pdf In PDF document text
    • http://mariancozma.com/_user/file/21478954023.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/wuwojenizogex.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/17e3916b9c41dc8e9f38c64d9f8caa32/45434928042.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cbb3e1a05---xesidulabokugedar.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/seted.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3449b1db5b---nibisixatuwuvim.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///20217171438121934.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/betatomoxeworavalajivajek.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/87859562300.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/91995999932.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/45696881824.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/39a1af22eecea29dec089777432cd1b2/jatojemi.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/fewozobemulaz.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/kizufebub.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/48252965295.pdfIn PDF document text
    • http://haai.org/upload/file/zetudowinezix.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3c8d4a234e8f81f97cc5ca54f7660c85/tevogakefabutawupigozoxe.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93bf2e829a---jotuzosedali.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501080957651653.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b538e65efd8---40506518874.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/6e47a4f700dd9f0a6ef7496436e99c4c/20494874625.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/dekeleseg.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610315fddd785---15049605008.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/lolenarozuregi.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/25775909487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=devilkin+user+manualPDF 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_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001012b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 10312 bytes
SHA-256: 87beaf73099aa339657842098f58d52a9d74c78994bef026a349bd223dda92cd
font_02_sfnt_off0001185e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185E 17992 bytes
SHA-256: 7905f08ee2051fbce6ffa3db96bb8b709dee066a7e0be48fd28025439c480593

Open this report in the interactive analyzer, or submit your own file for analysis.