Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2644941edfa6dc9…

MALICIOUS

PDF

86.6 KB Created: 2021-07-02 11:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e9d3bbeffa0ef344c79a0e40dcd24d12 SHA-1: 0059564acdaa7a91262287092e04ab30d81000ce SHA-256: a2644941edfa6dc968723ee69967bd1adbb9a3bf24ac5ff5642e34623049e18c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to external websites. Several heuristics indicate that these links are part of a link farm, with some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://xanbiente.de/userfiles/file/wojamoxuki.pdf In PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/fg2ku99fhlmgd9a1rpo6mfi16n/83875830081.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/fipumakibuzojovukivur.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d340f2d263---99836422653.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f621ab77359ab943784007469aec7a69/xerupazo.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/48537269357.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/gafevoxevuxim.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/nagotane.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/aa08efc34be25532e0cf65b8c492bfb0/fikunejupavovenofiwegeso.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/17122a60a641f28cd834229f2f839f9d/77397687873.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/d4807e569f8a134a715a43f569d6ef87/jinowadivefewamebize.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd730721d4---leropuzolol.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/6b3366790c271f543919e92761ac02b0/nisuwilu.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/93d227e95749b7cbeec4a2217070d5e9/xovuwikelelidijuvanumub.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a60e68353a---84014937289.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf911eda014---37215093805.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/9o074jeg6qsoadlnht2o00hlfu/luwomilu.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/62737034177.pdfIn PDF document text
    • https://aneri12.cz/res/file/85538743973.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a73ff07c48b---97461506273.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/97365385062.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ru3gbdfml3um0kgkfto674b7rc/zesupad.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/537feefad7f2b5ba8e875112d8c2e447/95622986538.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/77471105298.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf8prdbsiv688so97r0cbljrva/76246651263.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7ab720551---jebujovidejusolevewurakof.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608544df7d15d---josajurowiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=flat+roof+to+pitched+roofPDF 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_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 10420 bytes
SHA-256: 12c75dd40d5afc30a26674034cb3eb83934c971311a46f0e19505f9473f46451
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 17076 bytes
SHA-256: f8c478faf35f60bb34c0b93125d3d6965098ea770726fe6d2798a1b441c98180
font_02_sfnt_off000134d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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