Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd9d4c6fef58a16…

MALICIOUS

PDF

72.2 KB Created: 2021-10-04 09:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f771e5b9c8d5e6a5c8b81bbf4bc730e1 SHA-1: e99d85d22cc05dc55b97a02f8c6cc77d380c8fd3 SHA-256: 7fd9d4c6fef58a163d10af5cf0d64f289bc78ffd6cc695f391f7494acb58f86e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised websites and point to other PDF files. This behaviour is indicative of a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://shreenatharcade.com/userfiles/file/33386997418.pdf In PDF document text
    • https://foodvellythailand.com/upload/files/79331214500.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/86011705003.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7411a48bc868489bcf0964ea94bd232/62814056292.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2f09a5122f6b7cca3c5a7a2529ed1b42/97928861338.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/6402746436.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144ec25dba23---85742667650.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/37544c01e3ebf205c24c566de7fe62c6/bixor.pdfIn PDF document text
    • http://grafitym.kz/files/file/betovejakuduw.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/wemasijupevikaruzuviz.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/mozetedavizadewevor.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/36086190858.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210921053702.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16147629ee09fd---34539551791.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/96328497105.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/gusuk.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/xegujesilegujekalijose.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/golosetifoxiva.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/47369807084.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/52669646992.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9a2326829---96194825058.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/20614551260.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/fovobunikaruwep.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/72736607587.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/16190407127.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/nudidubuxifej.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3db783cd345d65875d10faa557521e45/pedojixebowovowugol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=can+you+breed+spiders+in+minecraftPDF 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_off0000b659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE70 11120 bytes
SHA-256: 1cb33fc439c332ba5f6a7a5c64cf1457d09a3739c86b25be54971b3aca9f9881
font_02_sfnt_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 16796 bytes
SHA-256: 45e8e506604d0e03e2eec1927d5049c412189f64340ee97840e2ab9917bd27e1

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