Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8706f093b112ce…

MALICIOUS

PDF

105.5 KB Created: 2021-10-05 21:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59ee1020cdbaad56ee3318f8fb34a192 SHA-1: 79e2e93f9506167e6d1fc3c1b19fc1c1b05a89f5 SHA-256: 1c8706f093b112ce3cb18870bb1523ab15f1e6837ba253a978aa088f41de98fa
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://wangguanhardware.com/userfiles/file/16753854874.pdf
    • http://ilkemymm.com/image/files/47887514120.pdf
    • http://dylogistics.com/userData/board/file/tofegalasuwagar.pdf
    • http://nexxosrealty.com/userfiles/files/xotuzinar.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/26199566269.pdf
    • http://tourbusan.net/FileData/ckfinder/files/20211003_CAB89CF3FC46B9B4.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/aa5630683bb27a2b1c13609e813f8b18/11757513477.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/kowabibiragiwepizazega.pdf
    • https://fishuntpesca.it/file/dusexojatesebusan.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1f84d7860---48086861496.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2c90ce3c---8837614792.pdf
    • https://jhservice.net/imagenes/galeria/files/23402285623.pdf
    • http://jubileejec.com/userfiles/files/noxusenuvesini.pdf
    • http://autoscuolecasetta.it/userfiles/files/jogabobuwarajezowal.pdf
    • http://olivetheater.com/userData/board/file/83974396990.pdf
    • http://verynailscm.com/user_img/file/zawufigezesajemaj.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cba6ba688---zoxafu.pdf
    • http://thrifthelp.com/flash/thrifthelp.com/file/52664688770.pdf
    • http://xn--80aa5alfu.kz/file/2517849093.pdf
    • https://grup-insaat.com/userfiles/file/vivugegupunewobelidixod.pdf
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/88901790946.pdf
    • http://luchetti.it/userfiles/files/76798620622.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6e6b8ef74---kimogopasejinezu.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/89621ca66db0507648b6ff33530fc648/jezuvuxotemidavejelo.pdf
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/27993494821.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=smith+life+science+lion+king+answers
    • 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_off000131bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131BD 16792 bytes
font_01_sfnt_off000149d4.bin
4ab2aa8809c3852dfc6f19783a9cb6713154c8c3d93b6a6afa4b10936f0e3e11
pdf-font-stream PDF embedded font (sfnt) at offset 0x149D4 11036 bytes
font_02_sfnt_off00016360.bin
ef601deaa84d1a8fd0f66de3e2ace17e4b74dbac1d64ffa94caff9f74134549b
pdf-font-stream PDF embedded font (sfnt) at offset 0x16360 19848 bytes