Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a686d047dc4d50…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 12:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a668bddbbb9b9a97f9af9afed02ce683 SHA-1: 11a48a7769f7e0555576bca646d019d6c92d91bf SHA-256: d0a686d047dc4d505c05e46e43daed2ff24b638fa995a461b81a84cc01a15d4b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure and URL analysis are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://lagrupacio.cat/file/zupelinug.pdf In PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/61096732208.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4e6751a9e---34707260289.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce75d7acbe---23579310415.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/fenuvofumavevakatunoboxik.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/duwivuvukeruxerufebutepu.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/nijopugerenenodedobabinef.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/70260164902.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/67264325411.pdfIn PDF document text
    • https://austarpharma.com/upload/files/59558746817.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/35858651299.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/702c9f8a846a684fb4fbfe02ebadfa6f/logekepozudafitemilerutus.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/83922492362.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/laluzi.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/46187340884.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/15756048890.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210913165713.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210908225729.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/93525140026.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161374090243d4---89203986546.pdfIn PDF document text
    • https://makenie.com/upload/files/majelibaronigiraxanixi.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/bolulomog.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/85650761247.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeae30f307---65891085623.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e952bc15e---90685777260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+ecological+systems+theoryPDF 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_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 19056 bytes
SHA-256: 1fd378d6c6c91e484eb743077d6aac966f62efe17da34ee22122b5f59250233c
font_02_sfnt_off000129f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F8 10652 bytes
SHA-256: 6f5da9cf3b31d3e317652e1b74c27ed52c4bedf66caab244b4ab1a5f975a5ae0

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