Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a9c1217b05e9c4…

MALICIOUS

PDF

88.8 KB Created: 2021-08-12 05:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f543b67438276ecc2e8f3194f5bca746 SHA-1: a9395fc9a14700670753012721f80cf22627e924 SHA-256: 02a9c1217b05e9c4591d74fcaef883a1683d267bf826e8623eebf5823c15a386
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://www.pethouse.es/ckfinder/userfiles/files/56455927195.pdf In PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608751a092c12---fegotufunijokor.pdfIn PDF document text
    • http://renovator.cz/files/file/91464136744.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/lofasizabetaputomage.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab83742700c---gixevafava.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/27865738233.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd82ad5df---81817882253.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091821f61a7e---xawenomezasonerigo.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/25c933b7b7b9fed4a313f2f05803efd9/mavunugewik.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/57426406897.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/993d86a966fbdee4d053e003f3b8b5a6/daguso.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/4417127174904cb66c5a1da7aa4711be/70889982571.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/lominerubimivafomekebav.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1b94b263b---jogebelexubenixora.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/64940973978.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/xorilenunuvoti.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/55568546382.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610474a4a9e55---63148799682.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/b1uqk5s69ug8ivagt973i4i4c8/sagutabiwepezowide.pdfIn PDF document text
    • https://andana.us/files/files/bukigivixozig.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/42755841314.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106add6bfa58---24429512979.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/kpvh6139qgkfqiuenre6t8f6bq/lalutixotibefegab.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/87158093867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sultan+hindi+movie+in+tamilrockersPDF 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_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 10968 bytes
SHA-256: f55e80e086a888bb3c74f5d98acbc8ab0e3d3fb8573e5bd9a0e58f0248fe9b03
font_01_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 17052 bytes
SHA-256: 8f015f790050c7474a9112f2fd211e3fa110a28a8b89c672a1ab223cc7f13d72
font_02_sfnt_off00013c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1