Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc18b0a5d29f786…

MALICIOUS

PDF

125.0 KB Created: 2021-06-13 00:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ce4612da957deb0c6a8f649279f5f470 SHA-1: 5b9e3b2f8fd6eec11a8cdbc6a97a227d47a48795 SHA-256: 3fc18b0a5d29f78633c9af04e547f86c4301ab33eb77c5f445ba628b32513e95
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 0.9444

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 https://archism.ru/uplcv?utm_term=download+lagu+alone+marshmello+metrolagu PDF link annotation
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fe0a7d6dd---negobidipekinisig.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/nefugujodexup.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f5a239b192e1318cb082e3d4bc29573c/32925931029.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/9197013081.pdfIn PDF document text
    • https://drsaman.com/files/xivowitiru.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c3970a2bbcd07dade95a302e291cdf47/30233835657.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a0edd24e2b55476d856eeb37e4cb6e5/48646423093.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6265d3d4f6---mofevaremevasoza.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9191be094da93e7cfa86f2f63159b342/83147396162.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609746677a80f---kimul.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/aff9dbb492113b2e44b82cab3e22f3cd/xilazeno.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ig1fdq9fgqr9hg2phg7a4b3e8i/difurafesujerawozizem.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/509q8rh5u3i2k8rrj9mduanquo/saneb.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/ihckkffr3i874asj2ugetf9mr2/kifaluvujug.pdfIn PDF document text
    • https://amblamy.ee/upload/file/18160985072.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/22786291610.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18023 6588 bytes
SHA-256: b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831
font_01_sfnt_off0001909d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1909D 5328 bytes
SHA-256: d34a55e855a3519a1b3ffe56b8abfde2efe6c74c2b966ae3290ddecf398cf3f3
font_02_sfnt_off0001a29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A29F 13104 bytes
SHA-256: 9062da7b10b03d61a000872cd5c6a995641e65eb0948d7d1c07acbe1a1785e0b
font_03_sfnt_off0001cbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBCE 14072 bytes
SHA-256: f7acd1d9364464973c0013e40929b528168abfafe794541c0d44d85ff9cbe835

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