Malicious PDF — malware analysis report

Static analysis result for SHA-256 426d4b14cf806566…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 17:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15074f8931f2df234d5ab7ca8688f614 SHA-1: 47309bcdfe659b33b008c8073dd554238f83bba0 SHA-256: 426d4b14cf806566f5138fe36be1f95b13b75e8bff64abe0d80262efc1246616
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

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 https://abicecream.ru/ckfinder/userfiles/files/radakifa.pdf In PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396e22777b4---tifajo.pdfIn PDF document text
    • http://15881588.com/ckupload/files/46549299778.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/dogifufebevijelali.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/ronekudusafiwuwevetexoxe.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/teperisijebi.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161334212856b3---41779706733.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/nezezolefadanubobaxavave.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/76825683985.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/59422693473.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132232e1d677---64247271447.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/73647039559.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/75927693004.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/tonitekizejiwone.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/gezonulovexajaninivofa.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/besami.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a0b986598---wiperodizozujuna.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109141636407046.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/mevilipidinirawurutiv.pdfIn PDF document text
    • https://spyboarcams.com/files/puzituwubuvebovibewu.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/80500032737.pdfIn PDF document text
    • http://strahyi.ru/images/file/3396606244.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/dibokarirusal.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/69763146120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+black+widow+online+123PDF 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_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 18068 bytes
SHA-256: 43f5d5b55cec291cf8267c18c6bb3e126b9035a2c4dcc667fa0665fcda184660
font_01_sfnt_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 10852 bytes
SHA-256: 287e3b292dc1ef05c38bfb3197f9d03a8c7efbb3fbbb8406d288d9c0e056ce0a
font_02_sfnt_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1