Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24c5f9252b6f4bf…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 09:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 68309d729c72d3ed039007f3deab23e6 SHA-1: 18d8d4fb95f04c6928b1b5ba1fa2f33378732ce0 SHA-256: f24c5f9252b6f4bf02dc2166a7a01858a8a16e355716d352447629ef4efe37b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4n21ikiorv23n6e0d7mgam65cs/xosiwased.pdf In PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/vovokipogilakapolowixu.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/wuroxibipafosojezodev.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161321c929bdaf---83502254049.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/67790791873.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/27553479511.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/wudezilaxutudutefetaso.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090615271131.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/denugenefanubo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lj1l4tach55ncp5ae8ogg7q3e2/73033674480.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/roporabudamunezesurog.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/82443675218.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/gazalodusiwuwikuz.pdfIn PDF document text
    • http://recviem.ru/img/upload/93568041186.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/47455433758.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/jivipagawuziwofakido.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/23895991221.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/livasad.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/82599890852.pdfIn PDF document text
    • https://angem.fr/userfiles/file/kuxakewodanopinazetuje.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/42932716880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sniper+fury+mod+apk+latest+versionPDF 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_off0000e6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 18268 bytes
SHA-256: 8b4a94c1d7bf7011568943e61b4ccb17946e1e30330ad948af3d4400bd4b360b
font_01_sfnt_off00011678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 11108 bytes
SHA-256: df67d4e1a4c98f65983684f84e571d80732ddd5aaff90b8f09f8f052ca48edab
font_02_sfnt_off00013067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1