Malicious PDF — malware analysis report

Static analysis result for SHA-256 a751e0e2f4e27cdd…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 14:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54a1fd996194834e2201463af69e3644 SHA-1: 5ab15a65ca20efb4fef6732c7fd9767028d61be5 SHA-256: a751e0e2f4e27cdd8ff61e0f2f40364858a9f4da4a39a3380d4701474f901e9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable or compromised hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using link farms for malicious purposes. The embedded JavaScript likely facilitates the redirection or download of further malicious content, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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 https://greenways.at/userfiles/file/rizosurabasefelitatebipu.pdf In PDF document text
    • http://3gr-group.com/ci/userfiles/files/94866008737.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/xopuvotuzulomuvapoxuz.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/bexixekamapato.pdfIn PDF document text
    • https://emenu.hu/editor_up/74752731789.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/44086024832.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd8ec5c60b---90530650507.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/boxobasitibukiba.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaced521a9---xadup.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/29030050371.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/62451773511.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/54510943527.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/milavamegaj.pdfIn PDF document text
    • http://husplaza.hu/editor_up/kamara.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/bajofamar.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/32194203080.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb1b2a6c74---77626597613.pdfIn PDF document text
    • http://freeski.hu/freeski/file/xevemewovukaraguru.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/diwaxodepowosaz.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130594bed3c3---22091189314.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/95101717093.pdfIn PDF document text
    • http://4darchitecture.org/img/all/53701569552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+dragon+ball+z+kakarot+apkPDF 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_off0000d662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 10556 bytes
SHA-256: 32a0368e8187457b72f7c619583cb29312b3596b78dbdee1b63dc270c4dd1344
font_01_sfnt_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 17744 bytes
SHA-256: 60ae1050654555ee464a01ac12a9db5a81f4b918abb75f6d40ef9f8ecc28b54e
font_02_sfnt_off00011c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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