Malicious PDF — malware analysis report

Static analysis result for SHA-256 4018d2ff8465a60c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 13:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7fd7f890df4d8e3052256fe3bd32b294 SHA-1: 6a5c16ba33fc009863652a28faa935f7c1cd528e SHA-256: 4018d2ff8465a60cc672a4c3c519d4e013071fd2a1894cdadcb75306507542ea
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm structure suggest an attempt to exploit users by directing them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.bash.cl/media/file/73683783398.pdf In PDF document text
    • https://daulte.com/ckfinder/userfiles/files/3872163575.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/kedovilodusi.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/m2fadlrropv5pm0nd4pl1dvh86/90435411694.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/mavotibod.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/41003350068.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161419903799d7---86996086070.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219111621582107.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/26929344364.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/228cacf574e423255754732d1bf2059b/67758645923.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/9864362723.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/dudupiwefirixo.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/46c5a34db99119d39170ca8d79fa3886/sekejex.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/zolamubofidefuzunuba.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/34210534455.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/fuvaku.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/13685196922.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/varafegeviruroxebune.pdfIn PDF document text
    • https://sergiomauri.com/images/file/tijoxiratogetomerefoju.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/11312856326.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/0a031fac79f0907ad4628aee6b8a0b9f/nujetuterajutibidurez.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/53719089085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=meaning+of+angel+numbers+111PDF 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_off0000dcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 17488 bytes
SHA-256: 0366660a8d245b333ae13d0ce9a8cab966f6f39df514ecaf01fe984178e69f5d
font_02_sfnt_off000121c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 10744 bytes
SHA-256: 0cd3549cad97b3e798ffa7ebf8d0727ec659670fb692bf1e1db82fa37302f420

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