Malicious PDF — malware analysis report

Static analysis result for SHA-256 76aa8a72a414a2d8…

MALICIOUS

PDF

87.7 KB Created: 2021-06-25 20:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df18852dbe9767a541acdd5139888717 SHA-1: 251c5b547149947e9bb89c464230a1d038f71d7b SHA-256: 76aa8a72a414a2d874a1b01d9e1ee6501921317a0bbc8e6311fa2f08899e0773
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=britney+spears+everytime+video+meaning
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd08ffcb818---zafoxinepokadome.pdf
    • https://betentour.com/sites/default/files/file/62937309927.pdf
    • http://vce34.ru/attachments/file/25775918901.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081206005e5b---dofotupufavapaxegexuzen.pdf
    • http://baigeleather.com/userfiles/file/95719169501.pdf
    • https://aterhesseg.com/up_image/file/rezarizex.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/466b7d7548797d02b63619ef5a69a43f/43794756887.pdf
    • http://jr-bang.com/uploadfiles/20210624205549.pdf
    • http://bsbcarpet.com/userfiles/file/19772937021.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4872eab0---dejedoduxubexawixeso.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/74c5e62bf330d15a1a1f85a8e7c5b28c/11467671943.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/674c908f30af64a17ac684a397d13e2f/39162956921.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0917d56128a1ec52798ae8b52e18ad26/79794434821.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f98d7fd405de0b1eebb6d3bda4ab7ef2/votesomujaxovevewojubeme.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/20b841a19142be1b1fd1a6be36a3d8b0/vizaziso.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/709a51a3975dcbb03a5213050aeeec45/38358723610.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1903091a4---77077491169.pdf
    • http://auto-spec.ca/fck/file/36766098083.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160751aab816fe---57475016039.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/171e4780dadb6f16c9aa668801167d00/risagazuw.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e7f4b31308be2e210205542c8ba769e4/90186505664.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7b8084eb8---rawugo.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3a1c153c624aeb5db92d1c4515411a8b/ximaz.pdf
    • http://akinmedical.com/uploads/file/44484514558.pdf
    • 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_off0000f327.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 16792 bytes
font_01_sfnt_off00010b3e.bin
0a3ac6290a923f88f059a760e1d945d030b7c3a763ea738b9e02ce85adb3b776
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3E 10920 bytes
font_02_sfnt_off00012465.bin
babb18b50b9f853fbc8651a2a2f1c14902bc74154828f3e799356b74aec4adf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12465 16572 bytes