Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ade09f7f57c237…

MALICIOUS

PDF

97.8 KB Created: 2021-09-06 14:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 710338d4b81199d6352444d7bdfbcbea SHA-1: 4711ee11b90b12bc5397430a85d85c648b743d03 SHA-256: e4ade09f7f57c237ac179e6b2a4ea6fbe446d79edb90da4f33d2c731244e0f26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://younewstoday.com/task/userimages/file/24325571264.pdf In PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7b29bea9d---toxasutoxibirivowotudum.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/79046214060.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607988dc282a5---rokowaxogutubof.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161187f707f287---55949228452.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bb427c3ae1---noxusoser.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/35fc2d6d27079f5db5966c424e1e44aa/44442127500.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/23379864164.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/kavipinum.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a8d1627a953bb8db9336b74cc1c9d144/kamap.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/wavokepupegupiro.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/33554497715.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e57d81c25d5b30e39fd7ab815b03e406/35927474862.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/bopuk.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2189da3151d135ec670a780894a81828/31142826254.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/digiki.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bdb042f991---70586733032.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/98244045347.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/11092275880.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/vutazu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ccd942c89---vosanenugusujejof.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/1373918728.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0668b1f82---50932246189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=resultant+vector+problems+with+solutions+pdfPDF 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_off00011723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11723 18256 bytes
SHA-256: 49b98dbceb20a4178bc97f07505c1841472cea0dafb21c77827b166df16f3566
font_01_sfnt_off000146bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED6 11324 bytes
SHA-256: 4aa6df2008cc81958938f4b396865a1b22b4e31f061246fe4dc617e170bcd063