Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8299ed133e71559…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 08:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f5ed270e56021428d998ed71be8c453 SHA-1: 3bd9a1c63d06eaf3f898db99b4703a15c2c89eb3 SHA-256: c8299ed133e71559acd5a0363cb5f50f28ec8d6118153201aba15d9ff879bc66
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document content likely attempts to trick users into changing payment details. While no scripts were directly extracted, the presence of numerous embedded URLs pointing to potentially compromised or disposable hosting suggests a mechanism for delivering further malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://beautyyaurient.com/editor_upload/file/nobiderinemanejuji.pdf In PDF document text
    • https://akonis.ch/userfiles/files/pefetesinavebadoxo.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/mopejamelusotejez.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/jaxexifoponajaguxe.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/20680493895.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/6gqgt8e50qocbv42vn90lm9f02/danavudivawekaxewamoxomu.pdfIn PDF document text
    • http://erimti.com/userfiles/file/9740569259.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1611ca19ea423b---ligubisadisuvibefomirowuw.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3c9268182---10760380346.pdfIn PDF document text
    • https://fond.ru/userfiles/file/27447601989.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/a11a699b1fcf75835690e03c8ac2c8b3/bodazulepajufipexo.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/54067019667.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/61644730314.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca89248bb0---zufekidakabubigixa.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/jetilizazovupun.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/kigelosasuz.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2bfccd76c---36846344218.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/nesowim.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/36925903066.pdfIn PDF document text
    • https://inks.bg/userfiles/file/49129301477.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/24760247221.pdfIn PDF document text
    • http://ned.ru/uploads/files/sinekotexum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=purchase+consideration+methods+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_off0000cb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 10940 bytes
SHA-256: c9d46a43241af0788feab8f3c3e10f4b6d2f1cfe2108f981aec6bb00e662eb7d
font_02_sfnt_off0000fcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 17256 bytes
SHA-256: 4103b7f4770d8cebec2b58cf419f3518bb67e9848fca4f883de420e3886a3986

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