Malicious PDF — malware analysis report

Static analysis result for SHA-256 91268dfbb2694d73…

MALICIOUS

PDF

75.5 KB Created: 2021-09-21 22:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0bc913da30b97caaa6f6a02628a91095 SHA-1: c7b9161a50a592700e0bae8cda634c1134cd53d3 SHA-256: 91268dfbb2694d73c0f53532bbc34461b0f5c4e7b2f4b56e4dea72cdb4f24fde
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://archism.ru/uplcv?utm_term=how+many+patterns+are+there+to+unlock+a+phone PDF link annotation
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/91893508972.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/17901030616.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e39c2298516613bf2b811a37beecb90b/nivezirizimaxagajeli.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/tivezutufaguxufimuminikun.pdfIn PDF document text
    • https://angkalaris.com/contents/files/37059003987.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/58156667223.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091306011152.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffbbf6a497---gawiketilotunawid.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/30650558977.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/70531178478.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376a1182d9f---zulab.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/xagefejemaz.pdfIn PDF document text
    • https://flomogroup.com/upload/files/renetufaremolaf.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/97270984439.pdfIn PDF document text
    • http://chikatere.com/Upload/files/79014010179.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/xopuvumixozirorewi.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/52639776317.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/nafakuzisotipenozalon.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/zazapexexawukafodo.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/80739158891.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/29030309969.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/gonuvapamebumidofowapavu.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090111342769.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/bexoxatuxemusezilurofes.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/fumeden.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/xojamesuselexararejuteb.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/rojuwubabedokuzenof.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/90806294157.pdfIn PDF document text
    • 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_off0000c3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 10928 bytes
SHA-256: 26cd600377325abdc1aed91f396cea6413163c2c2e101e5d83c379abc8065107
font_02_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 16684 bytes
SHA-256: f8dc2812ecb81954c88008b317b5265b3127be4cb1ba50674e5e657cb2d06874

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