Malicious PDF — malware analysis report

Static analysis result for SHA-256 527a5f305923b8fb…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 09:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0952b239adb04eb95447b18f47972160 SHA-1: 2a34d9cdd85201655db4699fd5d2af09ecf0d108 SHA-256: 527a5f305923b8fb382e9b6a2b180e44749e5ae0536b301f22ae1fc66e832325
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution lure. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://hairtransplantmangalore.com/uploaded_files/userfiles/files/gugidonokovadagopizusu.pdf In PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/talabizinevaxopogigot.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/17d5fb798b7c0433eb672434b437176d/89730044668.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611a4f4ee0cd0---28949846802.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/54390644822.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c5ff873711820f7db64a115b861fe32d/83538327856.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27830233264.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/xabefaluvivek.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/26803163209.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160742691d2bf7---xefezemiwawev.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ss87ei80mmr7jhtqck5d5l2m61/gevabuvobexili.pdfIn PDF document text
    • http://shamayachts.com/upload/file/luwetagatabirebusenudes.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fa2742bbf8e35d3e36a54bfaac729870/limiv.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/valagemo.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/56602152482.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/89123155024.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/46823681886.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/mowomabo.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/72084143990.pdfIn PDF document text
    • https://bauarch.bg/files/renofiwa.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a92fcae52---wolujekirovemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=figurative+language+cards+pdfPDF 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_off0000c70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70E 10820 bytes
SHA-256: 18e140d837c9da1f8a650eaa772958880d696e96fdf8a1d2007d86661e850100
font_01_sfnt_off0000dfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 17860 bytes
SHA-256: 783187c805ac3fbb8be4ea53b639b60e93644939789b1912e56e936e0df17ee4

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