Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c313fdff1f9d151…

MALICIOUS

PDF

90.0 KB Created: 2021-06-21 10:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c8bd6b53fc5e7fd3fc69b2c824ed1255 SHA-1: d7260912a61f2cd18d5d0656c35eb6e369d56b76 SHA-256: 2c313fdff1f9d151162fc7448259749eef09514041dd94403cfa61322fffb8a9
154 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 0.8017

Heuristics 5

  • 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
  • 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://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1055533f9---wevida.pdf In PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a914979bb11---26319447240.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd7586d45c---lubego.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/92ef761057a44baedd4700f97dc945b6/31703811765.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/2jsno52gtbqtfiptujtju0vrd3/80511854226.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfb5b8fd37---67010209952.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021060406322773499.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/66390260462.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/220056193568.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3bfbc91a4d44d60965673b14d16b9110/tezodupereminamebuwatadav.pdfIn PDF document text
    • https://digicpictures.com/downloads/6081111512.pdfIn PDF document text
    • http://iviltra.lt/images/files/dabagizut.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/jevefubedupetetawone.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085352d02015---degikulum.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/608ec40971209e6b03d1dbd4230cf914/58455979138.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/nirujitud.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/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ela+r6+elitePDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 4184 bytes
SHA-256: b3aeca8bac048295dd8da99043171a456111efbe0b732678c48f87cc00c02a6b
font_01_sfnt_off000111ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CE 10796 bytes
SHA-256: ef9c8ab8052a3e7a9ebbc564a198685ac755dea030112481edc40c9cde3114bd
font_02_sfnt_off00013396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13396 12996 bytes
SHA-256: dea0806171265e4416d72efc0aa717e8bc8bfaba88ce2a2f6f478147c0c835fe

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