Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7c6104568cc449…

MALICIOUS

PDF

97.2 KB Created: 2021-06-29 00:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8caf20c1097983aef2c4e7068f5433d2 SHA-1: 38d1f67a0341f65f784f85f5dfc78c3fdad643a0 SHA-256: 8e7c6104568cc449601c7825bd3af2a128b488df623c3fac4d5150b5a2c042c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other potentially malicious content. The presence of these links suggests the document is designed to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/rr864ncbn5qhvlvceo5le4s3s4/sigobagu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e5ab5321e---kavorurobogagubor.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b90c7315a---sarokozomezefivalija.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef1026cc78---wetetopalumonipolati.pdf
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/zezubozekiwovirabif.pdf
    • http://hitecds.com/userfiles/file/77520420804.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a855991789882ababc1c0a4a2d86de7/tapelewod.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2eaad3fbc---54364833515.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9e16b3661---golixi.pdf
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/remepedag.pdf
    • http://tivatijapan.com/uploads/userfiles/file/zepitataretevologotupu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608058a915d4d---60889457161.pdf
    • http://writtenmail.com/upload_images/file/78226580621.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0qdaavrs8e5atuvpp9eae9cc75/gafisu.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e2e44f92247858047ce33444a20a0fc4/22788618403.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160755af89ae7c---9571999389.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/kb44qj880hbo6l5gbaa0e0h5o7/25470388326.pdf
    • https://chmelo.hu/sites/default/files/file/baxelobufapejupegofo.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc467073034---rusudiruvujebupinegire.pdf
    • https://kabelkyaobuv.sk/editor_uploads/files/99589540834.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9e91a8dc67e7fa6683a34570c98ab3eb/tiridadikuxotanu.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609eedb034340---fizamaja.pdf
    • http://www.alfapilates.pl/upload/file/xatuxajekixuvora.pdf
    • http://rld-carbon.ru/file/lawezojegokar.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=veronica+and+jd+heathers
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eced.bin
10038744153542ea7c6c9a3587a32e98aa7011975ecd16fbe663c1a6373c1b01
pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 16892 bytes
font_01_sfnt_off0001054c.bin
0cf04c89604dd9c622bfffb09ef4a7a904cb40db859ef52981d7f88c307fc9a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 21756 bytes
font_02_sfnt_off00013bf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF8 16792 bytes
font_03_sfnt_off00015405.bin
fe85e0a8a2678545e8e288ad89090fc3bf64d51d8303fb23b502e97109b2793a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15405 1744 bytes
font_04_sfnt_off00015c47.bin
b61ad04e709ba9196f497df3b47e60c428211b3e095dc8a3e562dea670ef86c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C47 10520 bytes