Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfeb39e21e23bfdd…

MALICIOUS

PDF

84.8 KB Created: 2021-05-05 03:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 6a85c88485be04872412a0261a744960 SHA-1: ed1f07287617fdd97eba4f4d82e0129608306c93 SHA-256: cfeb39e21e23bfddb770e4f69acf610a3f1aa203ae3b7a849032487aa07c5d55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, indicating a link farm used for distributing malicious content. The presence of external URIs and link farms suggests an attempt to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076c48b17081---tomejipipavejowi.pdf In PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701f4a9c4e6---96773182332.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071037583bc7---18537676836.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/niibaj21kvnv5r29uu241r6rbn/71621991061.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb11da2362---darubipoxudexex.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814f8092fb5---27461970625.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc00625d1---wegaroza.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e343c95c---jutososojabamazugajeduka.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/08250567a2ae4779ba091c91d3a4bbf8/60934840192.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608266e5d465f---79371453399.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/1309889449.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/544e1fe15f5495780a0df96931b7d9d4/xusivatipexagikadowa.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b81c3b30351f625260e51bd1a49414ad/8903278141.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/cfd78cefb05a0fc8d8880739380f09a7/93725049347.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780d4086255---56091216180.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/bff3a703b2e276202cd186afe745e31a/pazenomofowalutor.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4cfb7dfebca91b8181cfa8674c661e1/pifapew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=concert+scherzo+arutunian+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://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_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 3172 bytes
SHA-256: a9d695caad155615fa1daf257d9428c584ceff674dc76831b172c96fd192a399
font_01_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 5168 bytes
SHA-256: 90e8927ff3dd2de4b9c32692893a4cbfb5a577e2ae2b490705e2c29e01e57eeb
font_02_sfnt_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 13028 bytes
SHA-256: e3a7e6e7ed38ec20901d31d48393b240f2ad47f71ee0dd594c43f0c23a41274f
font_03_sfnt_off00012f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8D 16364 bytes
SHA-256: bb94d9e2d29e84aa7fad153ffb016e1914fddf771f3168e8a23f36873561d695

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