Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7ed57453145a52…

MALICIOUS

PDF

79.0 KB Created: 2021-06-22 12:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1ebc6c558ddbfaf4be7b1c4cfb86acbc SHA-1: 07f7d5b1b44ad34006139599543c25f3a0010fe3 SHA-256: 0c7ed57453145a52de3d623bcfb9daaeb386c70f6316a2fa98a524d61abf6b4f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9996

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a741ce1c5---rizuzawim.pdf In PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c02d6eaf9---9292023286.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95d0217c41---49767773081.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4d43e03c14cb6ded10f1baf6521e8617/52818329544.pdfIn PDF document text
    • http://poorclarescork.ie/images/fulididasaxipuxewefala.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8493282a---28190099633.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/4d5be687309e8334a9cbfc7e06bb940f/66925769485.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/001448dc53f359a923a1bd826c34f6da/91231974501.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608511a58a43c---jogipasidiwat.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b0063722604f7b28aeb5544c35e03b62/nulivapufawuran.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/87002452859.pdfIn PDF document text
    • https://ebooksweb.net/files/file/78130134288.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/46jt0f8rri29bkvf1tkbgpvds2/sejopujumifapibozo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf07704065---fofejomevawuvubadow.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2b81ae23b8366e2571420422042aa68f/80236309669.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/funarosewevami.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=shuddh+desi+romance+full+movie+download+720pPDF 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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 6004 bytes
SHA-256: 3340480d48a76eca43231f61224dd735e5ce300fac2959eac810b745a662cfae
font_01_sfnt_off0000e80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 5624 bytes
SHA-256: 2b8b95d8e9a6b42279b5acd3694056a53ee18c8e37c602ea14d44c7f4791429a
font_02_sfnt_off0000fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 10512 bytes
SHA-256: 6be5109569043b7337217a78616783a0623eeebe466ae39f06ca85c9f2a314f0
font_03_sfnt_off00011e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E49 3528 bytes
SHA-256: d269102e03de82912ce1c2868d3295ed2d60b56e5ed12383be4456b5448bc9e5

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