Malicious PDF — malware analysis report

Static analysis result for SHA-256 6229a2f7f99ea450…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 04:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94cb1245b35024f41665df0aed0783b8 SHA-1: 51a244dcfec53787e864672f8db2b640cdd69da3 SHA-256: 6229a2f7f99ea45052d734b547adb80384b2b9f89524187dd10baeb734f16b08
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS uploads. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://yogasol.cz/ckfinder/userfiles/files/21694118022.pdf
    • http://gayaarchi.com/userfiles/file/20210913201037.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614009db6b33a---72327221630.pdf
    • http://sacoorhealth.pt/site/upload/file/24329347716.pdf
    • https://turkeyinsurance.info/images/file/71271824964.pdf
    • https://ww150006.linebot.net/upfile/files/20210917202649.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161327760dba2b---matedesoritinip.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/r2suucsjf44bqo37bhspkg0r21/29009784445.pdf
    • https://www.bosingels.nl/ckfinder/userfiles/files/dofim.pdf
    • https://chaletsuenodesol.de/files/kanedidobalazolemotoxa.pdf
    • http://etalentlink.com/uploadfile/file///2021090523252597.pdf
    • http://vipnjl.com/userfiles/files/keguru.pdf
    • http://gayaarchi.com/userfiles/file/20210920041115.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613681c193a73---2669345793.pdf
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/58372358353.pdf
    • http://erdbau-rauch.at/bunesijaxejadumozatakese.pdf
    • https://easternresources.net/ckfinder/userfiles/files/59720366484.pdf
    • http://yule-sign.com/upload/editor/file/20210919084404.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/57492597629.pdf
    • https://dcimx.com/files/xojamiwukize.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=little+house+on+the+prairie+full+movie+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 16792 bytes
font_01_sfnt_off0000f3c5.bin
b6557b6d24fbf87a56bad3ef0088a1e2c26bd3e44107f9ce9a4cd847c7cbc6de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 18344 bytes
font_02_sfnt_off000122e1.bin
57e2045db125207da288da39cbde040e99ca058b4972febccb25cfd9ddd0f75f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 10748 bytes

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