Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3f9e0d71557024…

MALICIOUS

PDF

181.3 KB Created: 2021-05-15 06:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e9204638a852a51e0f01abf500984f86 SHA-1: 3cccfbc4bee86ad7e4baeb3a52b0042b1dd87ce1 SHA-256: fa3f9e0d715570241c75e3707a6a33eeef345cb08b35c60e8140b86682a2b334
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089bc699b75f---21483291322.pdf In PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/eaa08a2630d021462a0d6a3b901ecada/55468282204.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddcd811274---14098096018.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804689c01d0---dilugoketaxok.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16210244697494.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61893f897---10240514190.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/73d595db34c1237e92fb4565540f4232/75823238761.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/aa3cf96a59414ded2671b61a6ef080e2/41971071865.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/2ef4946beea3821ffd57a6edf620a7a0/31113163704.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160808af0ab02d---xawuraramojonabovakud.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084864553851---fovazemafowadataburujo.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160863c48bc97a---7934922240.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896b4d58b98---zalupukapifowumarujoz.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a972ba0658---14051257038.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e21f59a0d0---wexina.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/nowusotemogo.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/46933355ba3cc4f00b03b5ec09a615f3/67188829000.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945f5ca8633---40137991214.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=idsa+guidelines+coagulase+negative+staph+bacteremiaPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002681b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2681B 5504 bytes
SHA-256: 18aca38a2936be7fad28c145b1f69e6d7ce703d09ef7bf12da44b5a68a47f435
font_01_sfnt_off00027aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27AA1 11560 bytes
SHA-256: 86765fcf970059d07c4b83a9c3b5060db9e882da92f3514e660bdc26bf0a3215
font_02_sfnt_off0002a228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A228 16208 bytes
SHA-256: 9eb1045c6c392028d94d848b8bf0dbf72bb9a5ad66502643aef5ca2ba43648fb
font_03_sfnt_off0002b767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B767 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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