Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcedbbfb3e2d4d9…

MALICIOUS

PDF

91.9 KB Created: 2021-07-30 11:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74b1e73c1577fb3f0d7922951c227c59 SHA-1: b6cf2c8f5303cd9bd71f60ff2f1f967578a0330f SHA-256: efcedbbfb3e2d4d9a6bd66c9818b6bf3fb5d668b61dd7ceea7dffecb394f78c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. These URLs likely serve as a link farm to redirect users to malicious or phishing content. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c5302712d3c---72139248991.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4cceec0ba---bemajoxatanidakake.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7488e384d---78738474819.pdfIn PDF document text
    • http://raczcsalad.hu/files/puxotibebabiz.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/sawogifiburumiravir.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/19334062394.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/38946462042.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e38a201e2c---15252382708.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/fekuzirotomofiroxe.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/jonosedupa.pdfIn PDF document text
    • https://fallsplat.se/file/lamunovitazimi.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/74236617442.pdfIn PDF document text
    • http://llux.vn/uploads/files/vunewubadogipegiverezisop.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/94747649060.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/94789b0f3d4e5575d54f490deef018dd/bixaxetalefuzuzim.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4ab8b1e37---figekeviwujidiro.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/2427088282.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ca579e4397fda01444f3e9ddd846f3bc/wafameba.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf8ce20d50---97948069222.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095743f746b5---boronobujiverawejefe.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7ff88deb6699b1672e93317bd16cfc63/69120284862.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/fv58623urhmhn5t0u7n1e9eu1n/62883253306.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161013724a3162---65150265896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=list+chore+agenda+crosswordPDF 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_off00010430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 17076 bytes
SHA-256: 7534ffaeb3abfe3c90edb891a6342f3333c7c14c860b9b1bce2c17e8b28aa8aa
font_01_sfnt_off0001306c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14883 10648 bytes
SHA-256: d271e0f1e9b5d7891ce7d2bdf5b627ac6cf58496f1f51a6a238e9d435e67bea3

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