Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec57a9dd701186a9…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 22:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4be4346472efe9adb8a786758150c39a SHA-1: 83c6fb757e3f918f3b9165c0e251beb675510af2 SHA-256: ec57a9dd701186a9edd938b29953d05caf5f04488a97e2a874bf03e6e3788653
164 Risk Score

Malware Insights

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

The file is identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute malware or phish for credentials. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://nomylo.ru/uplcv?utm_term=the+conjuring+4+full+movie+download PDF link annotation
    • http://narnivet.com/userfiles/files/67529896006.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/nujokomedofinokiwemel.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/bifivuleg.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/sewosazuj.pdfIn PDF document text
    • http://z500.si/files/51923904485.pdfIn PDF document text
    • https://pokereshop.cz/data/file/zadizivivebo.pdfIn PDF document text
    • http://synfarm.com/upload/files/dolegugawegukosagazegu.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132a27b41263---56221150915.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/sofobevanijupe.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/27365988586.pdfIn PDF document text
    • http://poorclarescork.ie/images/80797747410.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/besijesu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e10dd08cf---41749485647.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/30494795584.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/67741429612.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109012230295556.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/pobew.pdfIn PDF document text
    • http://mayjack.com/upload/files/32980810820.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/8843767246.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/rulimokakos.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/67506023281.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee92fbc776---19824887089.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/puloxovodotimunatuv.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/vaxekopenuguvodorigesa.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/8cc0b12aa47affd2228965dda79d3e45/7286477624.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/vuwitip.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_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 11080 bytes
SHA-256: f245643b48fbefbfcb5d66277eeb42dcc3af6e306fc89a6d63089c62d31b99d1
font_01_sfnt_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 17888 bytes
SHA-256: 95adc6c9274a8ce040078fb1fdb91b01e9dc6d486f6ae3e487c2de739e5672dd
font_02_sfnt_off00012f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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