Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e4be0df5e3d5b0…

MALICIOUS

PDF

81.3 KB Created: 2021-07-16 00:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0eb20958df02974b2da5784a9ca43cad SHA-1: 8fd5dbf6d5172c5b047d37047ecfdd9c7d85daed SHA-256: b2e4be0df5e3d5b098e95a9393c0526b69f66ca3f9d86a788fca8ae78c2b7ccd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of disposable hosting indicate an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f74f080e41---20639599950.pdf In PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d6c8234e5d86980cb7822130a8045721/80938514697.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/57613422351.pdfIn PDF document text
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/bamimidadakugufuguwaz.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/5fup92m96kb52r4vcablq337ol/57482753236.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/97783741274.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/42250942148.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/suravaretemi.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/fokurexiwixepiwotab.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b62ec3c9aa---76267919179.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/zikakitexivadisuke.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/j24ibdmvagopnha45sq2tjidul/92512337413.pdfIn PDF document text
    • https://people11people.gr/uploads/File/relazexilevasobiwakale.pdfIn PDF document text
    • https://nevisnews.com/userfiles/45832915890.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d94a898aae3---musifigeja.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/19645304368.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b59ee51aed---guganepawuwomuni.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/adb494f918c74c16a7a3339aa8ca66a8/movubexabi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/89f86e2e2be33c60f67c59bbc947c82a/63542301235.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/kijolodus.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/341ff755ba92af38cd5635407fad005a/lujasedoxabati.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/2d937fb7b6e3d8d727df4375dce1fd3c/2235062480.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/pinojebepivuk.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/paranezed.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f05c902c4b1---konosojaki.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/76168880100.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202151956531567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=environment+derived+from+french+wordPDF 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_off0000db47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 17116 bytes
SHA-256: bdf65786fbfb3077876f65d42531741494d58c41c5510c1cb83222fa78b19a7e
font_02_sfnt_off00012022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12022 10500 bytes
SHA-256: 81b7cc12ff70431d0b6ad03e8f4d0fdabe31560f9bea5bccbba07464ff11945f

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