Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb95b3f42d98e6c…

MALICIOUS

PDF

95.6 KB Created: 2021-08-18 15:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b60a08791ac5b3ff0e39a8071ecbcac5 SHA-1: f9ff82dadb3270be80ea3b767619b370e0976a87 SHA-256: ecb95b3f42d98e6c637120ca6bccd66e5781a174d284afe3c4510057a7b5e93f
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or malware distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 7

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=monster+trips+chaos+mod+apk+unlimited+money PDF link annotation
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/941c7d501d39951055320f549780560e/19981900230.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/botiri.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/r8imi1gba03ovqovu6vioa36ub/takotawigoxuzaxonakoruw.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/36934112510.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c56dd24dfa---29808690400.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/sizawugag.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b631b623269---wixuwowejogulifisix.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/43480363594.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160de19c9624bc---totuwarunusebokogabibew.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/3801385268.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/xunazigob.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/siwexomodobip.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/31f951c4f34dec35e533aeed580fbbcb/disupug.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fa4117b0d8dedcbe88a9064781d81f14/nedategivapefumapapu.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/bexazezasalojuseta.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/figamewusavevunefovagofa.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a814c75c443---rimakijisewutokopijime.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/n2ek5bi8v3vguc0q7icukm70q6/sototelolovovek.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/99394227531.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/32860218268.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/20824179264.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/zukaketixuxakepin.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5b6ec00dd---lenaval.pdfIn PDF document text
    • http://haai.org/upload/file/26840794835.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/k3lttff2i06anr0a3l1ciqtg5i/xedobisux.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/bce76ef6ffb45eb34c9ae981cc7468d0/xumuzinusoguru.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 17344 bytes
SHA-256: 04095b2fcc9e5dd5e5150f97e531cf11d5643f682fdbb5879f58a5dc6eaa8df9
font_01_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C0 11080 bytes
SHA-256: 4a060ea5443639941553c1e10290c790c7e033971b1656b156c512debd4a4eb1
font_03_sfnt_off00014f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F63 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_04_sfnt_off00015792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15792 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

Open this report in the interactive analyzer, or submit your own file for analysis.