Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca409837e7b2c6d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 22:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da8c93551b5b1b0de8460b587912ba66 SHA-1: 88b2607be90f555cb1260651285b8668a6081f2b SHA-256: aca409837e7b2c6db4185b6ebe78ccb708265814822dc52ac6b652c681bb5d3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://ageddfjtj.pretty-match.com/upload/files/95164027327.pdf In PDF document text
    • http://fresh-j.info/images/uploadedimages/file/30246654089.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/gagow.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/93303247416.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/74292142641.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/98158349015.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136568ac1b29---37987710598.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343ca642533---tewebosidakosodafamaxiji.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/rerejezemajofipero.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/77621528796.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/29483790372.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b1bc14d13c69b560c18bd5312d642624/muxezevuxeveda.pdfIn PDF document text
    • http://dgjst.com/upfile/file/milaniraweje.pdfIn PDF document text
    • http://esipro.be/userfiles/file/35636794003.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/kikowe.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/93345793437.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/wixodelak.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/40057002612.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4fdb45df5---madexunuzabu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315fb5276d8---71783839541.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/semaj.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/66964916604.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/zumejas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=imessage+video+callPDF 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_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 10428 bytes
SHA-256: 95139b4734c358a474cfed5791dad46ab95ffcfcf1b309c49c1f7a5e041779b9
font_01_sfnt_off00010139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 17536 bytes
SHA-256: 7414918d2ff92b1f1f6e2ac0b1e03f5c8908a0b0796be12c7c9e1b870ba8c58a
font_02_sfnt_off00012e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1