Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e59e2b6ee0a3e10…

MALICIOUS

PDF

82.4 KB Created: 2021-08-18 12:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c6e658581cd85d156a8b245ff173f8a4 SHA-1: f57d1b459b97aad2b9afd677855d61fb5cd0d9fa SHA-256: 8e59e2b6ee0a3e108b230f3bf8e35067c456a492ef9093bec4b763efa244f16b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites hosting other PDF files, suggesting a link farm designed to distribute malicious content. The presence of external URIs and the overall structure indicate an attempt to lure users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://crewmak.ru/uplcv?utm_term=los+7+sacramentos+de+la+iglesia+catolica PDF link annotation
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cb3ad054---zosofow.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16074c751171ae---gogur.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/tofavasaki.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fb4566cba54cecd5c71d0ac4fc89fa7f/telanigavegivejorupus.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/55606933471.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/putaxo.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f8d1957d91399297ac0db0abdf4a6eb6/wokob.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nt6n1tisremomuo386v6rq2307/sevupufavufexixilevuw.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/juwudogavap.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/sinesubuvekikalomisojad.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8cb211684---pupegavaxoleg.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/0enisshfvhcgj5og679nrt2s77/metabobuvafi.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/lqjo6e51csqeuv1nst79p8hme6/34679237165.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913533781ff---31129823090.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210629085203.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/5446093137.pdfIn PDF document text
    • http://sy-smile.com/upload/files/65365862030.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/33027115524.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/23085189515.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/opi62er7ips20c0lprrgo8fk24/nibirujiwiwopivigaju.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/89836642.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/kebasi.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/92126618147.pdfIn 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://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_off0000dce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE5 10720 bytes
SHA-256: 973c1aea43aab488941efd0443ef0ca9fb35c17cfe703cb6eef712dabe6a48e8
font_01_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 17944 bytes
SHA-256: d207d050594256c308bab3e1b13db587f28f239a85c560833b6263a4075e441c