Malicious PDF — malware analysis report

Static analysis result for SHA-256 370c04171bb57eba…

MALICIOUS

PDF

88.1 KB Created: 2021-09-06 11:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 62ba5b56982148a5466e09677f04219d SHA-1: c7b4e213d9f3903f5b459cbe8f86b0ba78b94df5 SHA-256: 370c04171bb57ebabb6785e45b251045e863f91b95012aa5fdeac00f91e51e4d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs extracted point to compromised or disposable hosting, suggesting an attempt to distribute or redirect to malicious content. The PDF structure and embedded links are indicative of a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/359m53qvcg0662219buodvev46/88038421286.pdf In PDF document text
    • https://congchung7.com/upload/file/43392255669.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/21340667889.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109021921034848.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/nekozonetar.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0c56b7dde---bugigerutedu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e4069459fe64db75d9762d230a4dc743/mifijufamifunoper.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/sapokinipugurakuwal.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/95598200495.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160770dee10661---29270150477.pdfIn PDF document text
    • https://aneri12.cz/res/file/luzute.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a3312a394---gidovinurezag.pdfIn PDF document text
    • https://icbacademy.com/upload/files/7022579314.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1e02cfe09---pabolabegixetarezoferose.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161124e20a3ae3---57350653735.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609117f347686---94284467397.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/60648756757.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/jh2i2pemj261etcmkppk83jief/71551172902.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruxijimonuvitikojufo.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/21259650791.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/mofubisanuzos.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/57350109878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=everything+under+by+daisy+johnson+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_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 18336 bytes
SHA-256: c4633c85d942ae763df1d78c189131e45b5dacb812c41969957ce445c16a4f5c
font_01_sfnt_off00012110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12110 11264 bytes
SHA-256: 5cf8190541081f9d56046b6807d96d294dbb965488b856e8144e4498a01d8952
font_02_sfnt_off00013b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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