Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce20de5c0aa9c22…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 12:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aaaba2da0b3702bd39a765a912a13207 SHA-1: 00d3336a6fb99f004a4c28149e8b8e38854bc20c SHA-256: 1ce20de5c0aa9c2238ea24526e614b81ad8303e0099a5952a88d610ab144d6a1
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://safe-international.com/userfiles/file/80640946289.pdf In PDF document text
    • http://salon-urody-bellis.pl/images/file/44622167287.pdfIn PDF document text
    • https://emenu.hu/editor_up/guxoma.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/barokomegi.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/zalutesesuz.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/birenapifegopugejup.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/fotafozowuli.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/gimijasejopan.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vudubimuwijelukusapag.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/sufosugikixo.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/27186375332.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/kebezupolubirimowum.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/7971048279.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/midoso.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/87183687211.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210901134619.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4621dd232---kenegerafosijawaj.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/c3t8vieo0bdphr94u7n5cpcemq/tibodu.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/lisogebasenenubujudonulup.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/totesafi.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15950fe77---97483894140.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/difokelurijefugesonilu.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/nefoxataxisazalopeju.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/86770252141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=crystalline+companion+promo+codePDF 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_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 18740 bytes
SHA-256: 94d07aa8b3b743dda16af6e5dbbea8bca10ec5775e1d9be0e9616c8d30d42c8b
font_02_sfnt_off0001214e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214E 10820 bytes
SHA-256: c174ed50e19e64de8356dcd2db3a57e09f8d33706333fd8ec56116e37f59781e