Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77b52b02edc4165…

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 17:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99714d78b644b087ec785a0ddbfb5efe SHA-1: 8a703c31240eeaaf8c32bcf541aac970b051df47 SHA-256: f77b52b02edc4165603bb5e601d177f8d28b1321a98fbac9dbc04aeb2ac1532f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised or disposable hosting sites, likely to download malware. The presence of URLs with terms like 'idm latest version 2020 with crack' strongly suggests a lure for pirated software, a common tactic for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sun-green.nl/ckfinder/userfiles/files/ruxemobulerutidosiwuvita.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd2fe6c130---84258599075.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/15329829994.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/21934121653.pdfIn PDF document text
    • http://teknis.it/userfiles/files/72929480188.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/kapapajerogejonoxirinej.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/3fe61ef82a8396789c2de1bade04e0d9/55465571335.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/roaqk8r67abaolphdbpal9k23i/ketidugixofuzinodobu.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160951818f325a---35026116307.pdfIn PDF document text
    • http://belloverde.net/emailer/file/muzezibaxukexawito.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/vskt9tot4tj1d231om16toohvc/rexizilenuxaxidatevirewow.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/63005803009.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/kipuvedofunusovaj.pdfIn PDF document text
    • http://erex.hu/upload/file/toxanosaja.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/rifapuvizagur.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/072359a4439b52bb8109c9ec9ef2c6c9/pomisozijos.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/kebezabuz.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/tujeporuvalene.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/filakotedo.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/54219449688.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/madafegabujov.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/94301548239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=idm+latest+version+2020+with+crackPDF 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_off0000d3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E9 11072 bytes
SHA-256: af930208cce85d5290e6ff7713a9773b17075db80ae96ab4838dc4eb6a216745
font_01_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 18432 bytes
SHA-256: f4045c0c497ae36e2156b4525af8d9576dd5972aed77337b632fbc6f945b8b34
font_02_sfnt_off00011d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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