Malicious PDF — malware analysis report

Static analysis result for SHA-256 0598931085f75ffd…

MALICIOUS

PDF

87.0 KB Created: 2021-06-28 08:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ffb2b704d21704919419fcce489db36d SHA-1: 8cde706a3f495f70228c2d4fd1751d913f503ec1 SHA-256: 0598931085f75ffd615521819d1fb56f0f5f847caf6af20b7aedc30ec5c802a8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that utilizes a link farm hosted on compromised WordPress sites, directing users to download further PDF files. The presence of multiple links to potentially malicious PDFs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution campaign. Although no scripts were directly extracted, the nature of the links and the heuristic firings indicate an attempt to trick users into downloading malicious content, likely for phishing or to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55fa40ce90---33483859725.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/160030b06ea43824bad8b0690ef9c587/68574840560.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d2f2283daa1ee9ca18b96fb9380a3e25/liziketunewido.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b4998051c4d---20304512918.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/h1n4j1ovrff61pdjflqk5uoiiu/wosuzumodi.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/98469390942.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/sodapimininemusokibepos.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/fowisididipavilonanozogod.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/nb2oe4l7kqmb9i9p1ha834e844/lepavudul.pdfIn PDF document text
    • https://room12shio4.com/contents//files/72735638474.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/vezakubes.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/c90s4e3krkh0v584kd267mt4r4/1339134622.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/62488299458.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4e54955c153d489c80cca03b90b669b5/getegexugexerexugipe.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b2784726d5c---fapowoxevotulomewu.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e9c9ca5e0c9273162407ded8cdbbe610/retimatexe.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/bekanoronezepow.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ec202a6d---basisuwejudapuxuwukewunex.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/f90179a2a125a85e43eb78271140204f/guvufalijaxezusujavesod.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f671ee308c---15313013284.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/eim6ga6cnb4hqdoorouurvqof7/92725427640.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fef74a6e9---govafewaritukotuja.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/rozosezorojelapeleku.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/6oeal4dl5ot29pgroq8iemd3t7/jusixu.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/70022614649.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/56079637358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=city+of+houston+jail+searchPDF 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_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 18204 bytes
SHA-256: d226c53dd5581306b32adedd1cdb742566b04bd87d594c47c562bfe459eb68dc
font_01_sfnt_off00011d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D85 10808 bytes
SHA-256: 3056a033cae4a335982278482cc40d6c8fdb42c4577d8ad79a8676e9d6ba51b0
font_02_sfnt_off00013671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.