Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d00e0d931bf7ef…

MALICIOUS

PDF

91.1 KB Created: 2021-06-28 11:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e25f19fb966e30e539caec3f179c443a SHA-1: 5ece8cb63f82162ecf835401a910584ef0adbbd0 SHA-256: 71d00e0d931bf7efa53de276c806a21d08b5fe39d9c1f777b9256c41fd9ca25a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a shell, a common technique for executing downloaded payloads. Multiple URLs hosted on compromised CMS platforms suggest a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bustotoronto.com/userfiles/file/vojagudir.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/9ahbg8edre4i009o34o2ps0tg0/karufadebuz.pdf
    • http://simonide.org/userfiles/file/dolumagupusupeguvavewe.pdf
    • http://a-swiss.com/upload/userfiles/file/93061854227.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7100c477c---54907984191.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/b0be05029e9b959d478f41f77332f737/12211123072.pdf
    • http://velo.hu/UserFiles//file/lokefegaxejirikoxulifag.pdf
    • https://facade-metal.ch/ckfinder/userfiles/files/5976918015.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/bj6agsbaqt3aepvrhvte1n0mmn/82301617744.pdf
    • https://berbagiangka.com/contents//files/44186235102.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c1457ee4c---bisekaxizuresopi.pdf
    • https://stillwaiting.org/userfiles/file/33940325064.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58616107172.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbcde95154---gijutapexivoja.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/rfgjbihjj1uqgjd17cej3ku6u4/jixikorugefopogaxe.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b08f1b493fa9dc017f69847dd7868781/fewuligezibipijikisiwag.pdf
    • https://ludifrance.fr/userfiles/file/disagogepibusadu.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/suvknr0aifskb3khok79iie9l7/wifebafemijamodow.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d9480d2bb56823f09b4e81df45d7c58d/37163869624.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8341d1a968---96796806035.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/f0375co8sdbjs5f0m8sfjbf3li/bazobo.pdf
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/99207969622.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af713a80270---rumupafepivanid.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb099363ec---bozaforum.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/76d11v4kk24a075i5a939cm082/48323663562.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/54681215e3e0cab81d92adeaf42f7425/25116597424.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=linux+commands+in+windows+terminal
    • 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_off0000fea5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 16792 bytes
font_01_sfnt_off000116bc.bin
a1e9be42c714a59c493f69cbacd67a0ff12185fc36e6f469813cf0074553db9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x116BC 10776 bytes
font_02_sfnt_off00012f92.bin
9b895fa956a577d385af86614abbc54f578a51ed5bbb6a4598c6993932f3cb08
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F92 17868 bytes