Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b1c04d9b111e6c…

MALICIOUS

PDF

93.8 KB Created: 2021-08-02 10:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1f7696ee5d35e17fef7d28a9e161a4d SHA-1: cc5facc35687e8ba87a98052f552c4aba3de3a14 SHA-256: 18b1c04d9b111e6cc8527ab57e40d6651099e5b9745f4c8d6ff6aba9da0a5916
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=how+to+adjust+time+casio+protrek PDF link annotation
    • https://dorfadvertising.com/ckfinder/userfiles/files/gudulu.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/bekekazegas.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9cb3db4f2a5a59a8b92c4eb6a250f62b/fapinonune.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/77855441353.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/1a558660154ede0b8ab3e29809417c38/6078633241.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa3c945c6---37561697314.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cd0273de786b01b3f7b1cd3ec96cd957/93349448423.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ihstshnnq5sv5ludrhe47no6qj/29867887935.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/50f01d5e47aa369f19bf73b45609cc38/lojuwupijapiwebe.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b803a7a53a2---peborigivilujitekiwufolar.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27d4801031---mopuduwekulejidubasubomo.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/94083916320.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/95e19ca61a5a34de406ed10ac2db88e4/ponawixiwifegoninuv.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/1211b80850e196f085bdbd4b8e8848ec/77698799851.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/kagudewipezajimob.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098410f1c264---jelaseranagatufugadoka.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/99735679657.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/39rd2rsohvbug095g07qlvdcgd/wirumurujejaseriwaxate.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/govavidinafefilupibodukan.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/jixuwasegof.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a095888819417f07c374123f061cb7ac/vunivofilotaruxisunavezog.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/9599248790.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/79848437449.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_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 17352 bytes
SHA-256: b2d7a4706b66ced2cd217f359b26cefb274f51ae088fd3f49ee50a6a9fc348e1
font_02_sfnt_off00014c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C94 10924 bytes
SHA-256: a661164f816c42bbac5ebd572d78a4511199c10895b500150147b0528bcb6dd1

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