Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7e1446506f48a7…

MALICIOUS

PDF

76.8 KB Created: 2021-08-08 01:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 92a44a76fd43ca18e9a8bca783c20d60 SHA-1: 498ed54f361182b1d1de1c5523dde7aed9fa7dc0 SHA-256: 5b7e1446506f48a77e2243bad9df158cd2173690f9392141c6898be77bd39138
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous links and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or lure users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://arch-teh.com/pic/userfile/48362075648.pdf In PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/tuvezugusemusigamazigo.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/xatajejoladogufibawabo.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/xopazisojomapejimi.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/7nrp5kmsvn7e3pgdug4c24gbe7/20245160682.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106a7aa906f8---kuxakotuvoxatinikepag.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/konatoxowuzuzutojulefim.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f52aeef7b---69315394680.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/23696690258.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/50194839379.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/89320483857.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/bagaz.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/50595342522.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/fbu44emumd1p0i9q0320qpp9jg/5730430939.pdfIn PDF document text
    • https://ccskin.com/geektic/files/46873903886.pdfIn PDF document text
    • http://airmon.hu/images/files/kusikajaguk.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/17219039014.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16106bbad492ac---44284274229.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6d1a3e448---gamupizo.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/7782143210.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/44840300601.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/nibolud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=paper.io+2+unblocked+games+wtfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC643 11568 bytes
SHA-256: 440fb7c4857f7e7fcef70f5697c2d2fcf24d7b436754e5f8d458179133941b81
font_01_sfnt_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 16756 bytes
SHA-256: 16d47160a281ce47ed8a6993f4d53be6c85996218d31038261bac2654c97b9e7

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