Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da28b2eb7e307fe…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 11:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f3d422a1eb7d24fa33026db9927c302 SHA-1: c861acc4e7ab9fb5f902252197455a93c9b26170 SHA-256: 4da28b2eb7e307fe23b220548b7371bde9a67b2ac1b572a88f5ed8e17a302012
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the heuristic firings strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://oniceh.ru/uplcv?utm_term=program+do+edycji+muzyki+android PDF link annotation
    • http://amuseonline.com/absite/userfiles/file/25512121458.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/96323581913.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/13262561307.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/tananajugedimujaluxum.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/3718717015.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138170646cac---9620350461.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/ludukosumedesi.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/junowuledatubewegepiwim.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161389bf656739---kegogutepuxadeduz.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/xakuvesutatovexigomupir.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/kavafirezakomakuturujow.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/nebeg.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131497e93985---66837220105.pdfIn PDF document text
    • http://precisao.net/files/files/27592576931.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/45922209938.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/34743015925.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/fewudigasij.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/rixumozadamutunego.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/jeriruta.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/xobiz.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/39701797105.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/70730613769.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/91636664181.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/ximinitimitebidofika.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/97269463625.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_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 10900 bytes
SHA-256: f3718a007ea15a7e37937d52e1b294eb2085ec1a2bbdb1b0b875c288a71f9a77
font_01_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 18452 bytes
SHA-256: 95aff0f3f6d1e161455229c8221da8898f689f30c02a69a8655aa44ce5113ac2
font_02_sfnt_off0001292b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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