Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e1227b4b2e884d…

MALICIOUS

PDF

73.4 KB Created: 2021-06-20 06:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a8db0705343621611f31e47b2c175d50 SHA-1: 68694650ac559e93c8c0b0531471abaa09433aa1 SHA-256: 56e1227b4b2e884d178be3febd75f0c6616d98ae4b718ad583c843dfdd263dc2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm pointing to compromised WordPress sites, likely intended to distribute malware. The ML classifier strongly indicates maliciousness, and the presence of multiple external URIs suggests an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to facilitate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ae47b7da4---70616933822.pdf In PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/seic66dh65ogmlgv9pvpb8nphj/48166571310.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f45d23b79d---naluwujifejebakaxa.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/3299581504.pdfIn PDF document text
    • http://edgecs.net/documents/nujonixixekesomezoru.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/wevixexuzadexazedaxo.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/xazibujebenusezizimukajot.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9f7891a8---55678294411.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22c76ece2---91238524061.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c1d921fc4c0110194f71d45f778b94a8/tenonufijusorefidiwuda.pdfIn PDF document text
    • http://skomi.ru/img/files/file/ludokovinafaronu.pdfIn PDF document text
    • https://biocoils.com/img/file/97665837389.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070e65a57f78---wipuzag.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba92aa19a---84158304780.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4911bf34d2ef3e365381732373f35d94/49180832568.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/19907028284.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/736b6a721c326a975c64f337791c0159/sajiwomatiforef.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe294d32c---vikitesezedek.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607adbc0a2990---72633694017.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/77924028526.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=geometry+dash+2.2+apk+pcPDF 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://scripts.sil.org/OFLIn 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_off0000c8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DF 5644 bytes
SHA-256: c304751eab16343c8c618955d8c2de3ab76f9ffff30bb83109019fd745f1c9f4
font_01_sfnt_off0000dbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 11972 bytes
SHA-256: 95eb54382753ec9bf02c8d833124f4acde6f2de5b1ae499062e8402ec821cad8
font_02_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 16104 bytes
SHA-256: 38a759f114b03df808f01d873d7dd82ac1d98a07cede416bfaa7a366f0b13987