Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c5345eb1b8ec75…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 10:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3142be11967f9e4794a883ae98f24ee SHA-1: 05e50e406aad293f962db549cd327a413abb60f8 SHA-256: 23c5345eb1b8ec7565a4f7d5d3acf3a8f03b92ee3ac1ae4f5f774346b6ca383b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised websites or disposable hosting. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://alternatifmedikal.com/img/userfiles/files/kixewibiwipufun.pdf In PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/t41l5o064vmjn08o6dbqdorqei/wuzebojuwafevajimorusu.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/38359aeca9e23de8a8b6c16916e0b2c5/jojokakutaferavira.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/pawikawonivodovagizewo.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/81567742612.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161029f294b9da---74286434103.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/23775714984.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/56366577728.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161045c73a7dba---66683167395.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/d060e36b0be965817fcfe7e23e45a86d/48213890273.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/sasewejupobisefusorima.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/wogobedaxoboxegivunavaku.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/6062603592.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/74824208074.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/logiroxuwodevupo.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/beveja.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/64824335675.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/nepix.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/85603198253.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/xabarojujiwimago.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/60565196907.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ebb034007---19080145330.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc2c3c9f8c---lufowuvotomoluxuliwom.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/21319986537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=strength+of+materials+1+formulas+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_off0000bdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCC 17132 bytes
SHA-256: 75b015ff1462a85e0ffb76c7423141e950347b9c12d3d4c3007a5ccdad079741
font_01_sfnt_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 11172 bytes
SHA-256: ea2844e64652d819027c994d6ed4934dbc0a74ed11c700696a147e41f6e943e2
font_02_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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