Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c8416452d9ea57…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 16:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fcd4931593f8d4cdebf53aa1c625557e SHA-1: d16e8b43f285931ca54152ca7d17bb693b9ec055 SHA-256: 59c8416452d9ea57ac6d27621fddd343df0503336aff9c2dc36007517d0c5c90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the heuristic firings strongly indicate a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=4th+edition+monster+manual+pdf PDF link annotation
    • https://amzentransportationindustries.com/admin/imagetemp1/file/24572009157.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/bedodalepugeborovizowewu.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/41044707434.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/vuxogevaresezulalim.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/xisotizejufa.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/lipazaduvomagid.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/bexejinuxajelofapesepa.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161350919891ab---rotixozavorezomijodo.pdfIn PDF document text
    • http://nensi.si/upload/file/vixakegewiginenon.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/zelosezobolowo.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/54039210854.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/zemutosasomutemuzaribi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a384f73d2a---juliparabejiwigew.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/vegezelemenalepenavidana.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/wijovototajazowoninukuna.pdfIn PDF document text
    • http://www.greenlakecruises.com/ckfinder/userfiles/files/45716507849.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/65150045190.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/25390667017.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/rutibaxetotepulariwokexug.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/sekuvivudufelanepa.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136e78f0c533---6061978281.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/18541335160.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/819473c757360e9737b72a4b91ebdd03/gulemadaze.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7f3eb520---wodesaworutum.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/baninosotetaromezuvam.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 17892 bytes
SHA-256: 9fe9e7a4dc02463089e71af6b38c8d82f1cc29523471c8a5ffed07a838ff73bf
font_01_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 10844 bytes
SHA-256: a85e46cec08e52f6380ce32dc08fb41d35c83bc177d3c3e544ad1c10e6ece618
font_02_sfnt_off0001227a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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