Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aeaa85039511baa…

MALICIOUS

PDF

102.4 KB Created: 2021-09-02 17:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 95fbb2fe7729577041db4066c8da273d SHA-1: 251e054f6a3309596a587ed6d256c8131bb92a23 SHA-256: 3aeaa85039511baa998cf62c66a18a03572928c86e4bff004be1c7e344baf38a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely a lure to facilitate phishing or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6685

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://garglob.ru/uplcv?utm_term=development+of+maxilla+and+mandible+pdf PDF link annotation
    • http://puzynowska-kancelaria.com/userfiles/file/xoxesagesututowadaxodav.pdfIn PDF document text
    • http://premium-h.info/files/files/semewo.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/19694649909.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/morejegelemubiw.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/79530585091.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608efc119bfb9---27740399783.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/rebuvekejodibozeguvuv.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/0c0c0c81243efb401ea60b40911ccb9e/44457125873.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/kefafujiwogox.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e63741f5e---resegusen.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e9455fd408a---58947663810.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021522053552462.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/denixugojegitiv.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/zukute.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/gakajapafuk.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1b3078c3e---nidizikoneputebasure.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/81144471171.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63580832009.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/lonaxigilewoge.pdfIn PDF document text
    • https://shopabrang.com/images/files/972634781.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3863b0952---81178154480.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7a6fb793346b3c98c8a4d878f67a0f50/ludomamofavafiwogoduvuk.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/122234035ec9eb2d4696b5d7e096b8ea/15421702134.pdfIn 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_off00013682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13682 18804 bytes
SHA-256: 2f45f6ff4bf03eef440d366c3388490c13cfceec29f7e0353aad827ef6304c7e
font_01_sfnt_off0001678a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1678A 10700 bytes
SHA-256: 4379ff63f2b95b6d229d45925811446290167a91261cba3f814dca915b0b12a1
font_02_sfnt_off00017fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1