Malicious PDF — malware analysis report

Static analysis result for SHA-256 0917378c0430a47c…

MALICIOUS

PDF

84.8 KB Created: 2021-08-03 07:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 818661225a6e4a7b8537dfc8eb1f286c SHA-1: 57768e42d6ddd38dd4a695536e60f509fe4399c3 SHA-256: 0917378c0430a47c0549a4d27b36e04ea0ac9c40bc2dc1246c0e60ef1f7fb49f
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 0.9974

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 https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27c4e56ce3---denizawaba.pdf In PDF document text
    • https://nestsearch.in/admin/uploads/file/91380566459.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/24693693328.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/36051411165.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/52557607648.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/6772939911.pdfIn PDF document text
    • http://gsoutreach.net/clients/e/ea/ea4f28bd0b090870cbed8536b6d1d406/File/vivorasosipuzi.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af69e1c10c1---87729395560.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/kazeruwagapekujukefu.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/28892942158.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/pegiremu.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/47057251979.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/9325857602.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/75319981060.pdfIn PDF document text
    • https://vestol.bg/files/file/sosunabejogedanowadafo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e3e2c4e7a---fuweko.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/samebirarinakidoma.pdfIn PDF document text
    • https://khanikango.in/file/31264935203.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/nuwogaleravukiwariter.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/5ec1cf455c7c389cc47f3cdd708ef3d9/52762599699.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/kuxogovoxebokema.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/24142889564.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca81adcf8---70042393764.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/paxifiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=editorial+writing+format+pdfPDF 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_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 10612 bytes
SHA-256: a71f43e20170e13902f8dd117749bce8a9ed9ef5f155defe317099e1799abad3
font_01_sfnt_off00010199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 16996 bytes
SHA-256: 82795f6084dcc7bdacd9a2d8ce643bfb6e7f1fbfc3a63128e24107fe389bfd29
font_02_sfnt_off00012d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1