Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2dc79a3d59a3638…

MALICIOUS

PDF

80.0 KB Created: 2021-06-08 10:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b01251be92e6bc7bf620ddfe19e02a22 SHA-1: d853598ec9dbeff856dbb65f706dc18f58818da3 SHA-256: f2dc79a3d59a3638e8afcf04bd88715bcc24708d62ce0fd7669cf6423b976f8b
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-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 https://crewmak.ru/uplcv?utm_term=link+del+video+de+la+ni%25C3%25B1a+de+facebook+completo PDF link annotation
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1270965cc3a6b70f00a013515347f439/89865608118.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/fc28f668831730ccda47a45d86c94c14/30745219227.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aed38debb---77165923693.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/80113a1755c05589ae4d52d24e43ea47/61690758162.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/6j9tgp5i9dsks0i21n4jqb3ci5/17749478993.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/k2k5h7n8p3rf4re8lgkbi2or5c/8809417405.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/offmgl3g2ktqs4khpahuqpsu32/26970945387.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e937a0e269---88712605644.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7aec86aee---86773699729.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/7adc6ca496fbc472f69da8966a30191c/97773586043.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sjijm4vukldf3sb39sa654tlp2/zuwetexuv.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/c10d0844a2b8e9cc83fb2e88ba9ba1d5/61356687446.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1cca87cfe---60423313748.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24f936dce---fofewolupumodivux.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/dbe858414bee33ff87f4f77e240eac7a/82318005525.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://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_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 5444 bytes
SHA-256: b2a4ef3c85b0553107891719fb05b57b2e77d706ee02c43e66905ab54090156d
font_01_sfnt_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 2528 bytes
SHA-256: c6252b4d8d750144d767bf15398de2e5b59ad7453580c69ac8a4daf0d2525ed8
font_02_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 11676 bytes
SHA-256: 4153e0e2dbd3ef41c25dc310312bebbef9462b52648ea7e1e7e0e9b668e95c94
font_03_sfnt_off00011782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11782 17168 bytes
SHA-256: 26ed0df6207ec2ff1981b63a2787598862210416d7294f441337104a44c72413

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