Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1bd555922bafc6…

MALICIOUS

PDF

90.3 KB Created: 2021-09-01 22:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 00bf722413191deb329b0a4c9bb1c214 SHA-1: 44c0f8a3ea44e79b7362083e51e93f9f07cc348b SHA-256: ce1bd555922bafc6c66dab6efd2362d2225235ed89650bdfb7bb18946be02c5c
216 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a seed-phrase/secret-recovery lure. 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 0.9982

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://philabc.ru/uplcv?utm_term=cryptography+computer+network PDF link annotation
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/80441320691.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/69338150905.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5ed6894f2---nakanev.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/90207656583.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/zomun.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/9560157766f1cb02b02a287143f937cd/mipegejopagotowe.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/mojejajowesozoxuveb.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b9e8ce724---82810343879.pdfIn PDF document text
    • http://www.polni.si/Images/files/43888666084.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d9515ec7---73483103281.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/89072337389.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/sewoza.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/lifovibufano.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/pissl6li6a800bb5h80pcdfd04/27270438634.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/14896367157.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/tipofasenav.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/4dlhdgn6hh45p1b3u2bllu0k9b/82900297516.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/0g7o5bcvfc2gta74cerlmjv58f/kikedan.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/62h535qdbvcg6kurdd570ab2r5/dubironepalatusulok.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/83543867373.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d20c859e---13713419618.pdfIn PDF document text
    • 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_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 19284 bytes
SHA-256: 58a1884ab5ac1d8830acf54ed242cf89fe4d6a9cfbe99f9b71409f66bfc80b10
font_01_sfnt_off00012a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A52 10940 bytes
SHA-256: 057b027ad1c0092b92919b02d0de500aea4de43e9f6a915bd5430eddd1498976
font_02_sfnt_off000143a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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