Malicious PDF — malware analysis report

Static analysis result for SHA-256 374fc7b4854c86b3…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 17:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f4a2b5c0197ac20c1f4da95fbc8711b SHA-1: 743f8d9cdfd7c426c64cb7a829277d3b3c6cc7eb SHA-256: 374fc7b4854c86b3cb0ba7bb4468ea74e94ac88cb1cc35358e28a1ac273fb5ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://plenerowe.kbo.pl/ckfinder/userfiles/files/619878082.pdf In PDF document text
    • http://bayernglobal.de/userVZ/file/gixikanexotof.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/783d5aa8873fe29be17cd5aa327e488d/59188195462.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16103aa1b6f654---54107841233.pdfIn PDF document text
    • http://zae.me/datafiles/file/97192795155.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/32834536031.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/teminotoral.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c449aa546---zujigalidugejubajuvipedu.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134403ecf261---86863922341.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/jonekelo.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/5249832427.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/09c0b5d09410f3fbbac097c80ed81330/rivawagepokosifirimarake.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f3d69398880cc85c9e18691b7e8303a9/74122068743.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160708b43a1678---88845751862.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bbf779175---nomevemuxujirijomaw.pdfIn PDF document text
    • http://ruihuitax.com/files/file/98933953419.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/gegokuvumekodixu.pdfIn PDF document text
    • http://htygroup.com/upload/files/bizemuvizekev.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/43422804978.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ff1b747dc---93756841003.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2a72p3jn8stgtorq4bjt592sq6/15499307678.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/83121844036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gcf+worksheets+grade+4PDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2D 17352 bytes
SHA-256: 03059a90af5f3733a182f09d95beed224b1ebe4f8fe4a395ffe48da7c46a06db
font_01_sfnt_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 10808 bytes
SHA-256: 143773936019cd28f7a8bb82f4cf512fc0ade59f7653638dac0b598b0aad8542
font_02_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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