Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ab8c49c5df3482…

MALICIOUS

PDF

84.0 KB Created: 2021-10-11 23:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d4a24ba7036e6e7a6e5a57e709ef7ac5 SHA-1: b2c48eb6099b87e551e42415c65a2d4c8a27ae5e SHA-256: a4ab8c49c5df3482a42ae5306676201553f842fe51e2b27e45dc70e45544261f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous external PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://888nv.ru/userfiles/file/51200894513.pdf In PDF document text
    • http://queenart.kr/userData/board/file/44146815966.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d316fdb8a093b4bc31300d28f6a09fde/debagutezefulibigotigi.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/nizagel.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///68925756036.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/pegegujutigagegijagototi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16162e68e5d87b---molozujisejisob.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615afe862f2db---kuluviwojawipividoz.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/82127533717.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/pifamakovunadeva.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/22075911035.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/zolujune.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/koleleladopaxomazofoga.pdfIn PDF document text
    • http://levotst.com/uploads/files/85967534076.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/tanelobimufusamiwuxozik.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/bufetugatifurebit.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/zuvewamopisifosunus.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/46310635566.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/kosevimagodivike.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161379abb85b1e---vafezulidexututos.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16148888261535---88193245900.pdfIn PDF document text
    • https://sergiomauri.com/images/file/difodute.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9cmuh2nsehovcpv7ia7rdetp8j/dotuxetutolisuzitepefo.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/UsNeCLCzgYg/uplcv?utm_term=court+ordered+maintenancePDF 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_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 19284 bytes
SHA-256: 05413cef79ddfd32d56b391b125375a06744ac0dd50ae9ddb8e6c2fec9532410
font_02_sfnt_off00012a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 10448 bytes
SHA-256: d77e1954a89881f53355957d64a42e08c9cb2964f0856a3cd1a033ddde2117af

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