Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6542bc89f9fa233…

MALICIOUS

PDF

92.7 KB Created: 2021-08-20 04:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f9553ddeb335c5795a3af5bc4dc7ad4 SHA-1: aeff6148be6427f1cb1c59db11564900463d4757 SHA-256: e6542bc89f9fa2334a8a0056f04bb4d2c481fe3b020dc0ab84126dfaf50b1f83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple compromised WordPress sites, each hosting further malicious PDFs. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to lead victims to more dangerous content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608126653437e---kipuniferemapelozera.pdf In PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e6388939d0f---vasogukedi.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/ae39113222e598201f478a4e0af58107/fawuzusopedabefud.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f8dd152496ea296736636a395386d103/viwud.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/wakibojapanuluvu.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/87866829856.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3c0dff40de37abd97751209d1430b2b7/zinimijanebozujulojori.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a725b8ea7a2---39689950244.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23ac69ad76---18134856838.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/rd0d3q0992a65ji75o22not25a/degofezuguvozaxepexazir.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084c9c9e8bdf---29173989380.pdfIn PDF document text
    • https://ikima.fr/uploads/file/sedax.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/01/lafodijefosemijukajite.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/12606259905.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/98301686352.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/25115430517.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/3ffm2o077unltpckuo5a7n0n0o/jexevakasivizos.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/6ef2893caaaf2a92c8d5ac5c1318c1bf/fisuwofofikanufukura.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/92404561537.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/44531900207.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19f14e240a---funopulugitijijotasem.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fac29c982---24867321882.pdfIn PDF document text
    • https://digireg.org/upload/wizatosifir.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/50174473496.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/62720995728.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/pabojuboxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=nicene+creed+text+presbyterianPDF 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_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 10676 bytes
SHA-256: 53745c628a8bb9f1c197e77273836b6129dcc4fc3d47d1da073e8ad486a3d930
font_01_sfnt_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 19388 bytes
SHA-256: 64b61819804a9041666592009f9e3ba689d359a3101f1ca7e00cec0b3d29a387
font_02_sfnt_off00014d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1