Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f83758f677f96c0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 04:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e82492d75f898210120e1e15681f46ec SHA-1: 346f3d51a033ab9c659b2c9bc8efd7914d40f026 SHA-256: 6f83758f677f96c0d849e271be5ec9a52a87c8707b451d2b88534f7255d3ae3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to potentially compromised or disposable hosting, suggests the document is designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://telechips.com/ckfinder/userfiles/files/jisufowexuputamavitomat.pdf In PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5d9956038ac434a941cd04db76b418cb/17996294089.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/44823753052.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/novobiz.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/tugewisenibakalu.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210916164617_8x1pgy.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130b042b7d46---zodiv.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/sarajajokivizises.pdfIn PDF document text
    • https://maymac.info/userfiles/file/3954689164.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/velodegigamemizosiwem.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/kuwubolulifowodux.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/pujuv.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/63436951775.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/84454253309.pdfIn PDF document text
    • http://fourfoods.com/images/files/vulef.pdfIn PDF document text
    • http://beta-rc.com/upload/files/196311750.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/salutaviwifut.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/2441175152.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/63323897695.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6c6eed4c4---70978322630.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/bekenadelutido.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd6e557bb---84554334989.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/difuwagokanezomiwo.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/sasabamewokesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=zfont+3+samsungPDF 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_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 10420 bytes
SHA-256: cfa3052a2fea33d70c8f4d62c90be9f05840807b455bfb03729e8ba610649f47
font_02_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 16912 bytes
SHA-256: cdc623b1450b7cf19b1150096e660795e498fc8425d566969f109266ba7dc510

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