Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9829e3f40344498…

MALICIOUS

PDF

113.7 KB Created: 2021-09-02 00:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10a7dbf738471c61bf040e05bc15259c SHA-1: da3b64b87fb4a5bd09970a1d4822be416e47d666 SHA-256: c9829e3f40344498aaa7c389f26bcf49f19e477c45d5e2ea3cf5099557565b8f
156 Risk Score

Malware Insights

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

The sample is a PDF file that exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://medvor.ru/uplcv?utm_term=sustainable+use+of+groundwater PDF link annotation
    • http://gerocuki.hu/user/file/83099804625.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/77137991754.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/7135949116.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/mejujurulukepamomowatoz.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a5d2dd7242aa5ae65ab86a501214a9c3/59437074786.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/bovexi.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161050ad4415de---bagapuxerorebokufu.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/f2b7e9cc375ab47df22ab82e82a23b69/retuxizanago.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160942d034329b---46088848540.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/kinabotefesodavo.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3780e503f---33441592171.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/beba350dc07b3e0ad39ea9c0313f4262/musodaxud.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e1eee82f42472da5b4245431e7ce4063/zobexasefad.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/dikazanuraxexok.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608500316bf7a---jogekojiwisinud.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/kisosipul.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3dc1542983155c30dc9e8ec07f659c49/xefowizipok.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/zadakejerowifadujota.pdfIn PDF document text
    • https://goldenapp.net/file/72808616201.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a073a61639f5b00421e962fc584ffc00/samilajefirudobumakop.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c25727fe5---ralebibep.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/76262166420.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/64378364499.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cee1da8027a775bde42d01ab94fbe31f/babubaso.pdfIn PDF document text
    • 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_off0001502c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16843 10932 bytes
SHA-256: b98eb83328c7f3384c579d481ade244e771949942f6e51d3a156ae939ee8c7d4
font_02_sfnt_off0001818b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1818B 21372 bytes
SHA-256: 572238b61f9d8fb01801816798427fcfd18917343b0e0e93f2abe26a66811438

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