Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a1216a1a3c657f…

MALICIOUS

PDF

97.6 KB Created: 2021-08-11 00:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87e42e2ab597417f7258ba25ceaf3b59 SHA-1: 39ae4d2fbb3619b87b90871aea6058016623b46a SHA-256: 76a1216a1a3c657fdd17978a6e91620cbb1e83dfcb711cdaa4dbfd49527367d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple compromised WordPress sites, likely to host malicious files or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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 https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a9d4f51d4c7deed9d39dd4eee508ea5/18434014503.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/12c0f21671ed699c4d14c808db40421d/76983604584.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48ac4eb4b0---39670877139.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e71b1c2692---98399148609.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/452b6fb87e72fb8af17b68ff2e8001a1/34247586384.pdf
    • http://studiogeologicotrilobite.com/userfiles/files/ritarebikutujoruse.pdf
    • http://haisushitogo.com/uploads/files/58426229201.pdf
    • https://soportedevida.mx/ckfinder/userfiles/files/33107910143.pdf
    • https://al-farh-iq.com/upload/userfiles/file/79928687199.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f92615386---toxipelefadowuvigeba.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/ede884ad4b66be06d6e7cfe829c1edc0/70165709735.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/828f9bebd3527276cf60b21568d34a4a/xudunovo.pdf
    • https://broadcasthub.com/ci/userfiles/files/97125456578.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c301bfbdd6d85d3e5eedaf6e3036de40/buvidivivoroposofali.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a8faeb344---minag.pdf
    • http://originalcheck.it/public/img_admin/file///mivizoxamesuwutira.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fcfc52648---sisijezoditevax.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/dibulujure.pdf
    • http://automsystem.com/UploadFile/file/20210610200316746.pdf
    • http://thanhtindesign.vn/uploads/image/files/sikil.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16214436071803.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/b13f6efbdf5af5c0780bbbb823c96b34/bawolefumomunivawadulo.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/97d9eb83e16dad8643f8a1f36db9ca78/53830582811.pdf
    • https://robertbah.si/files/file/rovefole.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/2054t1e7q09o2bfk1gda57e5av/sawowixarorutegapobawefer.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nowinirofenerukajanegemi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+kissing+booth+2+book+summary
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117a5.bin
9d0daaa7bdfb9507915d780b4f07112bb212676a45c8bc449f5af2020e20225a
pdf-font-stream PDF embedded font (sfnt) at offset 0x117A5 11036 bytes
font_01_sfnt_off00013143.bin
54559a7b4f283184726ea54f57ffd704fe80be008c8d2c32016704127b7d36c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13143 17604 bytes
font_02_sfnt_off00015f3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F3E 16792 bytes