Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbfa4ffd2b1e606…

MALICIOUS

PDF

89.9 KB Created: 2021-08-01 02:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d28bf92d2c36691e15eb9ea3773da66 SHA-1: 371f47066abe54dc866b9c6f3db9624dd76f6a29 SHA-256: 6bbfa4ffd2b1e60668a446a3c3748210c6b1465e68c289ba7a6aa947bdc44478
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are associated with compromised CMS uploads, strongly suggests this PDF is designed to lure users to malicious content or download further payloads. The embedded JavaScript is likely used to facilitate these actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://augustaelectricalwork.com/editorData/file/29687845659.pdf In PDF document text
    • https://nanyangtextile.com/userfiles/file/sisowumenozod.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/58038360856.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/26d82bb1285619c6fd9255dacde02da1/81761173245.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/43832460385.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/pijona.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/savefupizelemufozixavup.pdfIn PDF document text
    • http://billsky.ee/files/file/wegiwarufugoximesuxebaj.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/97018957580.pdfIn PDF document text
    • http://minniemleefamilyreunion.com/clients/4/46/4626b253669c69ed517e077132fb6553/File/sosez.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/93266eead524b1e8cd5270565fb3786a/biromevopebudusit.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bc5853d49---vogujo.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7d838e98d3ab5d92ad46fcacf99aa304/rupadulunanuketowus.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/botazijoxejuzivonodile.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/t4v19id1o5fhj40rp74e1nutg4/daligemixumikatixuleli.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3069f52d46---47281657291.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/6433567885.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d29269e74---95968277278.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/4030383020.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/s88nt2j5c87utbh3fpl0s24mqu/loritojojizu.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a8d89617---zovepefasutexijozi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb7f0ae4bc---91165100273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+turn+on+my+apple+wireless+keyboardPDF 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_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 11076 bytes
SHA-256: 4bd55f406e47e4c9124e4fa7ac4b221b9933ac866d9b7aa2dfa61c5597d8e32a
font_02_sfnt_off00012b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0B 17412 bytes
SHA-256: deeb5c3890355d997e68b4666711c841866fbd0a489a402f46f1609ac1a70862