Malicious PDF — malware analysis report

Static analysis result for SHA-256 34618543c5794a04…

MALICIOUS

PDF

85.7 KB Created: 2021-06-29 14:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2ca3dd3f17b6dc2c1a4ff2d7ce8cfe53 SHA-1: aaef285a94f670d607abaa648b0f17e92d3fff7b SHA-256: 34618543c5794a0433757fdf1fcc40ae8ae02606128e14cee72156c3c85776f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a4783da8162444c626c5014c2692eeb1/fopebonemodulik.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2c9c3aa67---wekawipoze.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/0e48c8b1c73e68359ab443deb77f73f7/dokigux.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/37bb8c184cdb0c995add0941c65e7844/pagasavonuvadujivobenedog.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/33aa3a2ee8705e3d1b56ef94ea229c2a/87383813023.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1413f804c5ed5f3b14bfff80bd3fad5e/89067800475.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdad5cc5bc8---takedelas.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/sokadimexikujafoku.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/sh1jqbr75s5veecsoskibvr649/81628138847.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/bozulozakodizuxita.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050122115451.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/53608777657.pdfIn PDF document text
    • https://datajournonepal.org/files/piwigibenote.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9cb2a94c---81237023723.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f9ad3e0a00a3d5eda9c2eadb429d1b17/11360672504.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/nerifowawev.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/6d430f4bfdab6b17388bf40f7babf879/tokududenuza.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc28ff0b262---94915073633.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707dd46e9a6---60616738544.pdfIn PDF document text
    • https://rajaunited.com/contents//files/vonazedu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wobujim.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/78d6da709fa9731cd636410a5e4a9414/37278735454.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/7rfckmg152omi7ins3hhhrm967/20907447089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=find+the+value+xPDF 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_off0000ec1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 17796 bytes
SHA-256: 02b2d7286514b5a871b9b46733a5bd35a5de2143c158b4c0044e18f472ca39e9
font_01_sfnt_off00011b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 10204 bytes
SHA-256: d196ddaba0a0e970168e4ed4afd6032977c5c1ffbd135955caee73278a2ce630
font_02_sfnt_off000131ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1