Malicious PDF — malware analysis report

Static analysis result for SHA-256 26143bd456e664a9…

MALICIOUS

PDF

85.1 KB Created: 2021-07-07 04:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92a206e077c6d85d3ad0dbbec6633ad9 SHA-1: 8f327c3fa07945610267ec2270501fe555a974f0 SHA-256: 26143bd456e664a904c933dd10f8aab998d8221b767e6fa539a82abb8c039107
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as Pdf.Phishing.Trojan. The file contains a link farm with numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malicious content or phishing for credentials. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://rajskiewakacje.pl/userfiles/file/39791798346.pdf In PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfe4f3a434---50800291854.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada41a45c9---bepujojibaditogazolit.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d90b181a40---17699335750.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf94f8d78e---tokalopi.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/31e396ceaa3b5f2615b98a42e7e95150/nafulivofusari.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/naruraruzenolajeta.pdfIn PDF document text
    • https://majubesar.org/contents//files/vadivutol.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609576db24ada---32449953070.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607769100700a---silifikaveladipelavobes.pdfIn PDF document text
    • http://www.moyekolodin.com/files/poxexevorozepemimaju.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7f4d42580---totugabavuvodob.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8b8da8b07e289bd3e02082f0fbf07fc/busepuxakixulekazopurik.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/71236680467.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864bffc7802---74777407944.pdfIn PDF document text
    • http://com123.vn/uploads/file/56127521478.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/74828146038.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/xinonejovibigimupisu.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/cd250bbc42154dfe186c9f1d1a9a0d79/dusesuzujafuremotet.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6b26c1844e52c84fdcc2413d2e3185ab/4420051693.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/98962188565.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/zekesidabumuremurov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=english+worksheets+for+class+10+cbse+with+answers+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_off0000e635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 11372 bytes
SHA-256: abb42d7cdb675bf63a2e864f7c9d538055988ef3abed8444184c4e67d7bfe77e
font_01_sfnt_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 17768 bytes
SHA-256: 760125fe1298d691e6ef804d06a57c516cd8e491a13d7bbc047cab549d5881c4

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