Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc3ca5acd4a3b49…

MALICIOUS

PDF

89.8 KB Created: 2021-07-17 18:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c70d4df06f5bca0d8e02d167721b3f70 SHA-1: a4d3feefa0a673c088f3ec986fb790626a963c30 SHA-256: bdc3ca5acd4a3b49ba781b798a6dc132509e6646ebfa503167d9ecbe8202b90a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8d053b7028dc786a1c04b7643f2e961f/xikivawi.pdf In PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/e039af25133aff80aa16116f194b5c96/fujovuxunitem.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ad9c7f204850c03cc6f72c694535199c/moviviratul.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/89036822331.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/55285230164.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/82729725754.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/48895140264.pdfIn PDF document text
    • http://www.centralperdana.com/file/616033840.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/suguworinavigedu.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/jawosigexefo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee5dc3b355---79406667741.pdfIn PDF document text
    • http://honghuibio.com/d/files/fovenufi.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b0244099---79090222379.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/llsao8ntgr5lral52i5s5o00e6/64496801075.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ecb34a2f25b---tipilekamuzuwaxuzadigegob.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987f8849ee3---bijizi.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/13/84393252187.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/nakepolusapubar.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/sotamesebebugimexuvumek.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5koohm69bu6las8r1u1mf6ehrk/toxeloboroten.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/jutafalugudoterajuso.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/82854487413.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609490925827d---3741565091.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/zobenilugigifebozap.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1c6bf9f2---34298818553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=definition+of+proprietyPDF 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_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 16428 bytes
SHA-256: a78e24bc0ead059ce926f41bc1bae1dc8b58ad31c882a2e8c23572f857dd0473
font_01_sfnt_off00012b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2F 10092 bytes
SHA-256: bbafae13d4a75da37f28f54d7fabcbe2ac71fd319ac68e63f172d3856bf70b4b
font_02_sfnt_off000141ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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