Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebc5862a361f022…

MALICIOUS

PDF

77.7 KB Created: 2021-06-21 20:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a2e2ee4191d24a2ae1e48c897ed4057a SHA-1: 56df5cd8e8f48e9cea25cc84fde914ba3c371daa SHA-256: 3ebc5862a361f022a7623d4bd044ac37ac885b8ec674d1433d24142f561cb8cd
176 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 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=mohit+tyagi+maths+notes+pdf PDF link annotation
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/0ved2c6n7rki8l6jpf7ja6svpm/44806292322.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab561d8c46---50577915263.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607529b919532---20795836458.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/753997a609ce753511a52c503493f40e/73467247651.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c010d4a278---44266758160.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/82644826681.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c619d08d713---rawowekezuzipobaborad.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609550ad1d81f---mevaxuvijalamezodojatomi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/t4qh81gqcomu22t5bj5jnco1p4/falasipinisokagima.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a3daf887a5c---zikakafikuzizit.pdfPDF link annotation
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d3966a5270829dd5483d37de31ea7463/mosabotitinexijovupapuluj.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/depafapujotiju.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/49744209159.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfc8767b4e---52372087286.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/90280253610.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_off0000d016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD016 5432 bytes
SHA-256: 1f4b96568cbd7e0565bdb5b2cf80b7478f204f46200dea55c8f8be9c6df6f573
font_01_sfnt_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 1940 bytes
SHA-256: 1ab201c977024bd86b4e3e4edf54c0f01ff765b49967ea531ea7fb5f4152d448
font_02_sfnt_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 11064 bytes
SHA-256: c084b1f5d6efa1459ed4e886785aa559c73a1b4b35cbb3b12a74d023be0efa11
font_03_sfnt_off000111f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F5 17084 bytes
SHA-256: 525faee9dab259eb2ef47ab6995b01e40cfe4e0ae95c5aeed9d7d709936698fc

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