Malicious PDF — malware analysis report

Static analysis result for SHA-256 4377e0771f762543…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 09:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a9577a0da97a2163b73480e4ed2f8f84 SHA-1: d55bfd610da06d20b41cb64a906566950c5333e7 SHA-256: 4377e0771f762543c84fd3499d06caaf42f88233af23a06d48e4d6d0b2d5ab71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The primary goal appears to be directing users to external content, potentially for SEO manipulation or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://karate-talence.com/newsite/userfiles/files/17082269459.pdf In PDF document text
    • https://bursac.net/userfiles/file/dowufabaruxutumo.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/lufukipirujinezivomer.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7655a87e0---41218101958.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/56962955115.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5d9327be7---69711387372.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/57451040028.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/mogepogefufumitisopumo.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/rugepezidi.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/pubomezuxulexenivuvibi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3115639156---46905682585.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b986cf9eb3d---mufifub.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/kerejegusajagumuwunedizan.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/8e8b20d14c70e30f6a426db572ff638b/wedivapuranodif.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa411b720---47235244017.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ce431cb0ea15b1f6ff7dceb17367d47e/12632792831.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e38215ba9---jejodulalamoxav.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ed368496c53---lawesuli.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/90344140109.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba1c73c487---38475146494.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/bikadimewagesokobufetit.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f239007b0b---sogokorudiwijesobikovide.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/6964700831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=oneness+of+god+in+islam+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_off0000db60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB60 10668 bytes
SHA-256: 0aedaccd6dbffd2922c2f417c755bbbc377e976f2a8677860c37d8024c16e145
font_01_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 16696 bytes
SHA-256: 4df153000c628ad38cc143d76212ddfb9f1cd4704dd93c92f8ed442418164bfd
font_02_sfnt_off00011df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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