Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7346e2a14fe0ea1…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 04:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4b383aad165a542f5ced6fc99784c818 SHA-1: 5b5d27fdf89feb389ff68c782267852e17b9650a SHA-256: d7346e2a14fe0ea12cc0dbdc7a2b16d5679cdb1aa11d7a15d9122af152052d94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/junaniwibup.pdf In PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092635e52e7c---78325519183.pdfIn PDF document text
    • https://irantruck.ir/data/file/tiwimebaregal.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/fotibimirodatabikebapofe.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/ac8623edf78d6f4eb2d85177543eb1dc/gatavelimu.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/13415519557.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/11215613235.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5428def221---xutalapekapoj.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdacab81b3---dudibupujawodevadi.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/sobogikuluxodamizazutuso.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850c440fe90---mevoretow.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/53074668337.pdfIn PDF document text
    • http://allycatering.com/userfiles/vabufujulipifabilofof.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a793e65a17e0a83c58b489077766300f/87468486625.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/tinexezipatevisawafidekek.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080780b5d3f6---38799629852.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/nowusuvop.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1ro7h0cjfn1cruqa75f19caao2/kuvaxulodijumalubu.pdfIn PDF document text
    • http://clingac.es/d/files/kisavegifepufukameto.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/gelarasewisa.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6dgcscg1u5eipflvi12jr4qkvo/41080240056.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/rifigamufunumavu.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/54dc539d2f4312dcced3e7e6a18107b8/kibojefigibuditenojaxox.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/97941822439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=gimp+2.1+user+manual+pdfPDF 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_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 17852 bytes
SHA-256: 377f7d3dfd9c5ef879df7da24d5c5c142c15cd23e5a6ce28c89d76bfc49a8518
font_01_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 10820 bytes
SHA-256: c12d1476ea92667dbb22ce171209f64ddf5b3d6862effd122a40100152545cf1
font_02_sfnt_off00012a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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