Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf6a78ce85ccdb8…

MALICIOUS

PDF

110.4 KB Created: 2021-09-22 09:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec2574da587dbef1b7c6be36210de39f SHA-1: f8c70cc6ac656f623f9cfc1c35a387cb36b34f21 SHA-256: ccf6a78ce85ccdb8ef5b2684469726d433fd40271bf5ce600e298b9a2512ccd0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/uplcv?utm_term=agario+apk+hack PDF link annotation
    • http://guchen.ru/d/files/48130327174.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161329d7321836---39425411294.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/99263033684.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/35173097294.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/45081939968.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/makar.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/49920318299.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/joletusefizu.pdfIn PDF document text
    • https://tigapilar.com/upload/files/pofibuwirisorevelekosisop.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331baa3c95e---begemalojosuniteruf.pdfIn PDF document text
    • https://sealskinz.ru/files/file/keganeketobevedilokitab.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/kixebomomaz.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7c5d947db2e813e3c8203ebf5a887690/61206886080.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/sowonubikifebigadeduko.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/wonapabegoranisojaw.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/87665461978.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///mogesedutepesujasif.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/forimokanin.pdfIn PDF document text
    • https://96662888.com/editor_upload/file/nabagewalenesar.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/5099357698.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210905111713.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/kubega.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/kamufajezijilunewas.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/sikasagokorufisinulemu.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/zebowibodeteva.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_off00014ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000166b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166B8 10180 bytes
SHA-256: 0718ea25c64c1e9f1a9122eb6eaf3b42b288031dd1c613515f812ecbc1a3345d
font_02_sfnt_off00017da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DA0 17752 bytes
SHA-256: 8a7570837a448e0165477d03299b9b7b5a55be4f1a2df0bcfeee63099f1cfaf3

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