Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d6a040b6028295…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 13:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ea05ae9c50e6bd07a7b85bf0ebeca10a SHA-1: 7cdd0b0e130b902836abf197b539522827daeca5 SHA-256: b8d6a040b60282954256cda1f93e1a6960d73fda1b6c2ac5963fa823ed65a489
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=graph+theory+an+introductory+course+pdf PDF link annotation
    • http://www.hon-ro.hu/userfiles/files/7172534894.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/973811a11344c23d9616607342f0dc95/94582937235.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f91877700aa---tagosazesi.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/sasadupevibejasera.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be66cd731---67966168004.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/63877204606.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/jiduretutunevasosi.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/19e91fe28608b3e2d2fa3edff394877f/kifigegamafeseraxobe.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/35840862976.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/84668191674.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nofosirixekamomelud.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/jipujojod.pdfIn PDF document text
    • http://www.celso.org/download/18917836884.pdfIn PDF document text
    • https://agatanorek.com/files/file/gaxovowelopinixasufaw.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/353a9a1aeec58918ad290870ea9fc08a/jagaxoduwokivafedofavan.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/bodebivedivalibobakure.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/nikow.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/53739451618.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/bvk297aoucpemnblme4g9hag62/72904450860.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/kasokirusipakakurokaz.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a8d36f2a4d722fa4d348d5a25357858f/85361023053.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072acc691e25---notere.pdfIn PDF document text
    • https://marigabung.com/contents/files/57101067513.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/9415329476.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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 10924 bytes
SHA-256: b3aa1395a082a907b79c628f7a37cefb37f4f524da5c1b79ab5040cdf537f976
font_01_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 17344 bytes
SHA-256: 59afa4560778dcba400449f3018d452201407f9185e14db83d595fd5a2ab8fbe
font_02_sfnt_off00012a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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