Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5c41608605fa8d…

MALICIOUS

PDF

70.1 KB Created: 2021-09-19 19:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00c9b593d4fcf24a5fb3c6f1ab5f9a76 SHA-1: 4a7bc068b991c054f59818b3b4dd72f961443b8a SHA-256: bf5c41608605fa8d5e5ca3523a7d7509928b0f265b93e6436b3b763e3fd76adb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://oniceh.ru/uplcv?utm_term=one+piece+iphone+live+wallpaper PDF link annotation
    • http://softwaretesting.kr/club/data/userfiles/file/20210918032915.pdfIn PDF document text
    • https://balmbeach.hometeamcorp.com/images/usr/26958908031.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/nokotujo.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/32776251915.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612feda03cd40---segerijipekobar.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/56231782613.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/66447485047.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613993867e64f---43709975329.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/givasimorapupepab.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/63502251244.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca1278ee0---39377819847.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/xixukevi.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/fafup.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/fexopamadusawomililusifot.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/dojavenalarasinojofo.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2e88c6e1e155729b297f43d40ed7532/36179049234.pdfIn PDF document text
    • http://sjhtractor.com/d/files/birumuju.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/93830320065.pdfIn PDF document text
    • https://thepainter.asia/upload/files/gabikete.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/kamutewa.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/misijefajawuludozudolud.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ba61b6cf---segevitapupozopudonom.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/5156757152.pdfIn PDF document text
    • http://sun-eko.eu/files/file/6070325282.pdfIn PDF document text
    • 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_off0000b461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB461 10380 bytes
SHA-256: 6b1553de6d21e8a7b97874b7815ace66818e38f2955cd0dc54c15c17e3f4d971
font_01_sfnt_off0000cbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 15172 bytes
SHA-256: 971329b0a0962d71ab9c014e943c8073bbd67ab225b46aa32ee5a3d7f38aacc3

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