Malicious PDF — malware analysis report

Static analysis result for SHA-256 9895249696af6d4f…

MALICIOUS

PDF

76.2 KB Created: 2021-09-10 23:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7af54404a33f298f9f0b2155ba563bb5 SHA-1: 686a13ffe1ba0d3c1aa1f15b846b00213f8612a6 SHA-256: 9895249696af6d4f0e2e071ff1bce9ca66e9dab15e408db5f3d7c4fc1455a76e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=best+media+player+for+android+2020 PDF link annotation
    • https://highlander-inn.com/assets/userfiles/files/49060919245.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/99098689560.pdfIn PDF document text
    • https://domilot.com/uploader/files/97426054610.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/12302244788.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/sovijalutudalojofu.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/55998660540.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/446c80cb2d84d7a95fed4677cdd207fc/32061748639.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/vakodolevetijalazegade.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/gogotepokubiradozuxabama.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090117232270554.pdfIn PDF document text
    • https://e-room.co/userfiles/file/zokanovuvukumikovur.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/16898118290.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f9a3a71314f0341b91b83ecadf9225ab/77882962359.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/77817719133.pdfIn PDF document text
    • http://ge-mak.com/files/nirumejeninasurosos.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/xexawedotutadu.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/gupemogebowuko.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/52481672785.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/firipusalonika.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d74b90f6---dikaraki.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210903222416297.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/33151789077.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/84303847084.pdfIn PDF document text
    • http://jarosi.hu/files/file/xutenokepupotaxomufuv.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_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 11068 bytes
SHA-256: a78226ec0ffca0cc75ec24f4d593c1f37dee932781272e33b4db2bedafae299d
font_01_sfnt_off0000e0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 16396 bytes
SHA-256: 4db4ed07d64eaa53ca0eab0266924a73b144be09a78d3b9c214f8b42cb37b79c
font_02_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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