Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a16c170386f63de…

MALICIOUS

PDF

88.7 KB Created: 2021-07-24 02:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd731d590b3ee59ad571154a7cc2da34 SHA-1: a9f389947bcac9dd57a95d1d1a6c979cdacc3b7e SHA-256: 3a16c170386f63de7d489c79c2d0d4fb8bba76789199825f676a7c20c4547a02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://cintabogor.com/Uploads/userfiles/files/2591829356.pdf In PDF document text
    • http://dragoniresorts.com/userfiles/tutiserekanefu.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/xikoloxuzesamerazono.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/96adfebe34a9c1fd3b8b5fc78ab2643d/59731409350.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/34a7e3e0993f9e45a83b6bb76d92b8aa/22732399407.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/80294285498.pdfIn PDF document text
    • http://stevis.cz/files/file/47467678087.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/612d47118245f2cf343596d3c4f4ca9c/lunuritudesorakede.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e350329e53---4822226255.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/59601417874.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/99436081943.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/89915522657.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/29149847273.pdfIn PDF document text
    • http://batdongsandautieng.com/upload/ck/files/tidawaletimi.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/39449437047.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ee2c4471c55fc7175e10f6275ff7a530/29406451513.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983476bef4d---pekejojiwepifetageti.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/gosene.pdfIn PDF document text
    • http://vhshf.de/File/tukabojubuvitorutagajebip.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/jorul.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/93345448740.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/35239538692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+are+the+elements+of+a+tragic+heroPDF 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_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11176 16380 bytes
SHA-256: c1459f4a7eab9c39652924c3e4d6413f75093e9e19a6fb400468f927a30023b6
font_02_sfnt_off00013be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE2 10776 bytes
SHA-256: f6589bc6bb7ba50b34ff4864b9cb1882ffeb38e090eb6ebde0d50550d9952e9a