Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b233e10f7e781e3…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 11:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64ebead64c9200cc69a97c73235315e6 SHA-1: 5ac61724b239f15b4cc89be6020fd418ca378365 SHA-256: 9b233e10f7e781e39a3adf9dd92ab131acb92d2ad8968629c72b94e9522025af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. Heuristics indicate these links are designed to obscure the true destination and leverage disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=kiwi+browser+sync+with+chrome PDF link annotation
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/93877302250.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/97701247625.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/dazapipipifavu.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/32683567944.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/51155071028.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614265393aba0---63350129693.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/jovav.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/mesanemolozazogofeg.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/pupilewunigan.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210906074454.pdfIn PDF document text
    • https://lazerom.pro/media/file/getasa.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16140761017882---34359503812.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/kijumopegafisaduxasa.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/31245482061.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c0382c1d8---muxaxufozirotasipinefis.pdfIn PDF document text
    • http://ashioke.com/images/library/File/51753568467.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/af18dc58d8c95fed8c5ac6ad4b7540bd/boxane.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/442511058681630462301.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/17094774538.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/17966912354.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/78368416641.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/91128927526.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/16424718660.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_off0000c014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC014 17592 bytes
SHA-256: a6415c7c4e1eadf0cfeb415d3540fbc76e804fec2d96f70fe836d551ea5d4dac
font_01_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 10620 bytes
SHA-256: 6dcc26d9c2205a7c666e850392e970522f651813c8f46675e3a987f87b506435
font_02_sfnt_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1