Malicious PDF — malware analysis report

Static analysis result for SHA-256 155779419d93eaea…

MALICIOUS

PDF

88.3 KB Created: 2021-08-10 12:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c466a658d88d7b2edb5522406d7c486 SHA-1: 327df5f4ebb7eac1f0c0eca6bf7d42db8a8c9c7f SHA-256: 155779419d93eaeab65d4665eb841f49a25b3b9097f1a22f119714712cb843a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allasclub.com/campannas/file/dezalunisi.pdf In PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/3lnfg3qejqbv25a8vfh3oe4103/15884328933.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/44536472821.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c1763c6e596cadc89743df8a56fbb6ea/kosudedasurafaloxived.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/21742938835.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a8a415d51---25226823353.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff52e85ea6---68653983885.pdfIn PDF document text
    • https://roc.mn/uploads/files/99727358915.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d6ff8061a---zojolugenuni.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611162a76d63d---lilomufareserukatape.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/15534879059.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e1887ac52b2ab1d9d3b3b52504bc1ded/30373637543.pdfIn PDF document text
    • https://koratspring.com/upload/file/45486344512.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/l0ccfhgic81r991tr3vbe746uv/xinofazomovexoxepe.pdfIn PDF document text
    • https://udruga-invalida.hr/files/nalifux.pdfIn PDF document text
    • http://kalikraft.com/images/file/midojevuromadekub.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cb8a598c6---15947997068.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/mfg06shclc16a6eji3c0rq5sdo/mutowewimaniridi.pdfIn PDF document text
    • http://gujaratbusinesspages.com/userfiles/file/96861155236.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/848d5ed949e420a1dd2b92ebd5a5dc8f/towaresisokexevevisukewe.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/97980650818.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/21353426266.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae216f0b33---fufamofuwofozaxipurobijox.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/dtunjbpioumq7er4mip7rtc0kg/91558275103.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/13dde28d8b6651a6174267113e1a0cc0/fajiwubosuvuwux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=manual+do+candidato+espcex+2020PDF 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_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 18972 bytes
SHA-256: 4a3b7ec5eaa9e3d36d31dcc0d3999fa124f6f946d9c38272fc96fbd509f40d66
font_01_sfnt_off00011fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB1 10844 bytes
SHA-256: 18cb1dbe20b882dfe6c55bf9f28fa9c12dc4594fe1e8de44c4bfa54fb153907f
font_02_sfnt_off000138de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.