Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9600ebfe6b0f74…

MALICIOUS

PDF

92.7 KB Created: 2021-06-27 23:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35dab38dc0e74f4396bb2b1becca7484 SHA-1: b783cdfbf39eb7874bfdfe3545ac9071ee696062 SHA-256: 9b9600ebfe6b0f744bc3b96f6bd6010d52942b2bea53781e210601b2df997889
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a link farm and a lure for clipboard command execution. The ML classifier strongly flagged this PDF as malicious. The document body is heavily obfuscated, but the presence of a clipboard command lure suggests an attempt to trick the user into executing commands, likely to download and run a secondary payload. The numerous embedded URLs point to various compromised websites, increasing the likelihood of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://irlanc.ru/uplcv?utm_term=ethernet+2+network+cable+unplugged
    • https://jerseyshorepirates.com/userfiles/files/4701192791.pdf
    • https://toolsatool.com/userfiles/files/bopinenetafi.pdf
    • https://dienlanhbachkhoa.info/upload/files/buxekejowopisiwexere.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/xidutelef.pdf
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/jumobeketoguz.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/d80lc31r17clar7nmqsncg43ck/gejogadiwamusu.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b67ddf50---86762790416.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/99478549359.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098ab6c549b9---98071744037.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3488fb51d8e3d58b9b03fc51a92c8071/duteku.pdf
    • http://palakkadtourism.in/ckfinder/userfiles/files/xareratusunepugabijix.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74397e387d---37195584114.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ef3d16596---2916658110.pdf
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20216211116344575.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086199858e7c---39451999586.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/mamegiferafafemakeg.pdf
    • https://vannordenvastgoed.nl/userfiles/file/79214688547.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/d56b127c97402c4b2120a50df8d234c0/tapizisolopezi.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4c5eb6297c0374dd6787140d8efcf72e/7583910245.pdf
    • http://ackerviewguesthouse.com/userfiles/file/51903601719.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/78afe93ba83190b625e24d6b37e854d3/61537195001.pdf
    • http://curry-box-deluxe.de/userfiles/file/gudejukodozadogafiluwefab.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076249aaf953---rufopatigagivun.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f661894d2---88642848355.pdf
    • http://watthaistuttgart.de/userfiles/file/91351174145.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ocb604027frn0dd48lgudde1l6/87476184817.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17e.bin
1824f665066396ebb7470b4dd8ec3e5adf952645ad06170befad943421bbab20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 17036 bytes
font_01_sfnt_off00011df1.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 16092 bytes
font_02_sfnt_off00013337.bin
a6feb39090e7b1c69fbd1e0ce8ebc3dcd03f3fa657fe7afc24a73e5c98d57401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13337 11056 bytes
font_03_sfnt_off00014c9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9A 16792 bytes

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