Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a19821089e10e00…

MALICIOUS

PDF

73.3 KB Created: 2021-09-26 10:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 07543f88dbf966cee1452cf7b7a872f3 SHA-1: a95c7cfc84c5c4b05a08f11664493f96a449cbae SHA-256: 9a19821089e10e0080cdbf4ce8a9d5b7ff57b9c11488b8bdc96cec3cd98549ab
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to appear legitimate, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirms links to compromised WordPress uploads. The embedded JavaScript likely facilitates the redirection to these malicious links, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/31024766772.pdf In PDF document text
    • https://funstore.dialog.org/userfiles/file/tuwujonabuxenutunan.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/54340850583.pdfIn PDF document text
    • http://wjcopy.com/upload/files/kolivuzigak.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/jazefugejepipewekujot.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210916100420193102hu24if.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/zedagazatokaxulinajak.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/xozagafobun.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/580d96f850ff790112ef762a05f9e4c6/50131408797.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/kakekiwujovelasudirolilat.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/8a1ba3de58caf0f8718de7b7948a8f42/67773524102.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/78648827767.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/1512120449.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/66682151476.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/waromafararukumanap.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/zewanomot.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/73392050871.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/vodoporevolitanilumevami.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/86154115991.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fnbgp542bg2f73mifuf5rskrm7/pujuliriwolo.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/pawoladedebeju.pdfIn PDF document text
    • https://davnosti.ru/upload/dafigakuboritew.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/17294923264.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/povogowivotesimepuji.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/25206053845.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/kawasenosoxusofalov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+change+google+play+account+on+android+phonePDF 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_off0000b861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB861 18220 bytes
SHA-256: 6d1cca1ed41a9e5f8339fa5ef64d1d528bb5f4711c5c799ef4b90e0b1bc1bb57
font_01_sfnt_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 10916 bytes
SHA-256: 7e92bd06e68a6554ec80464ea725b050b77bfcc5c4d6508f80c49771a94e8cc7
font_02_sfnt_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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