Malicious PDF — malware analysis report

Static analysis result for SHA-256 510d2256616a73fa…

MALICIOUS

PDF

94.6 KB Created: 2021-09-05 06:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 95495bc6028a613e458bda1335be097a SHA-1: b88a569d57410e581cb5cb74e34890de769369d6 SHA-256: 510d2256616a73fa8468a8644a3a83b7f9d3297f03c7eba73c8fbd2f2ebcdc78
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common tactic for executing secondary payloads. Several URLs hosted on compromised CMS platforms and disposable hosting were extracted, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://reclameindex.nl/images/uploads/fifudexojireripofuwan.pdf In PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ltr7om4uu5itudjlhcmlqc8k05/welabir.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612b91b3b4362---6791868786.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/1969446607.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/fafonedusexovigaparopofim.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf6780816---41412102287.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a6993d85ab0a55424b7cf6441c3125c6/pomakatik.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/5539151753.pdfIn PDF document text
    • https://digireg.nu/upload/18239999068.pdfIn PDF document text
    • https://airbays.com/userfiles/file/wuwopa.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/sipelubabijevepuwalizubip.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/b8d4629d664e9028d341f50f14e6364a/lukataxakov.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074951f93af4---21945899575.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210819_004315.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a0d2482917bde511c5d7662cc25b4154/gevoxuxuxorenanebet.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084e350de581---piwugubijenadilazalenap.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/suletogoxeni.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/e53l8df060j8m39p6ae2e4iam7/wibadebutut.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/5156756580.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/vorukogeragonitaso.pdfIn PDF document text
    • https://immobilgold.com/file/71559108195.pdfIn PDF document text
    • https://theurbanthinktank.com/files/sekusawazajedudulati.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/nokopikila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=vsco+filter+tutorial+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001225e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 19352 bytes
SHA-256: 8d152c4dd48693704dbecae96bbb215a1e1d1163c0dc7c0911b75b4970126b08
font_02_sfnt_off0001548f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548F 10580 bytes
SHA-256: d7a2add04d914afa1400fbbedc19a326f5682a1341d02ba98ce8948193515fcb