Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5baba01ad2f50f…

MALICIOUS

PDF

81.6 KB Created: 2021-08-22 06:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 159d736213be8c816db2908d4875c297 SHA-1: 8f6a3e6a29d05d9ccaefe46e92191eb442f75124 SHA-256: 7d5baba01ad2f50f10c566802bb91149113950eba217ba8f3ac8142e3fafc644
164 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically indicates that links point to compromised WordPress upload storage, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of a 'download button' lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://idealist.ro/userfiles/file/14141640637.pdf In PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/c835d755d08f86827a74a6af992b4474/romoketoni.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ba51c7f9d6143b2ef486e4dca55b84b0/rivakepasatuma.pdfIn PDF document text
    • http://belst.by/upload/file/17756613193.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/55523376382.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d799d9e9c---javebaz.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b9edbd3aa1b---jakofi.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/84107168752.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/76803717110.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e7cabb07d---51679312472.pdfIn PDF document text
    • http://bakoca.hu/files/file/46334593158.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/24383306009.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/wolotetirulixebo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7e56cc3b96220bdd83a22f7c6bcf730a/83155887139.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/telukixukekawex.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/e9edd22edcfb4ca44eb8e6383d8e6b12/kilowev.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/8243917398.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/34741422041.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/vupedixi.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/faxoroz.pdfIn PDF document text
    • http://ave-france.com/pics/files/34341418682.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/kekogutofonuwafetawe.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5osgf172ggtdl3rmerdeu3ugoa/79270338537.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/nekixamigiponowuxeropika.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f225a5c4f---9319329523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=analytical+reasoning+m+k+pandey+pdf+downloadPDF 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_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 11236 bytes
SHA-256: 8df3e1dd5d0dfa5cb8ab30f3154b4d1dc862f7d24fbe1b16f6d42efbaa81a597
font_02_sfnt_off00010c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 16840 bytes
SHA-256: 933634eb3aa40205d8c2e5adc0e6a2cc29bc017a6ab8630065cc246880524cd6

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