Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b22d633c514ecb…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 05:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b99c689b264e54a5148b3f715b9ff95e SHA-1: a0f4c4b8537cee9042c0e03b2f33ba5e33a81918 SHA-256: 18b22d633c514ecb5a34e96dc62565a63ff8001d6a6355dad1a02ae5aeffbe9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised websites. The PDF contains numerous embedded URLs, many of which are hosted on potentially compromised WordPress sites, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607340b1f0bba---59871152723.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ircnf27kt6fk8i5cp4ukmqre65/gezatifafujupuwoguza.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/jowubelulozolawanoti.pdfIn PDF document text
    • http://flardochform.se/userfiles/file/45811335181.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89a245f6d0---malazejewo.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/a1cd99b3d1fc3a6a18e5d087a839c4b8/jiratewafivewoweluvovexi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076d1ed61f74---81268020132.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/32410139456.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd0ae0cda---77856314562.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/muzarijejud.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/dudalivasuf.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/pexugovumokideselej.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/d3bfiqa1kj24d2st57oj0sup9d/49507147532.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/xujorogituwifosew.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab16beee5f4---2808935097.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/656dde9853bcb7be331953d945e45d69/62140583926.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/zujebejofilagakunozul.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/885222882f5e675ef45ed878c13030b0/24240120736.pdfIn PDF document text
    • http://shesob.com/file/files/tizodulivepabapiraro.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/winewiwudizuxufoxo.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/45660120408.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/0ec49e1b3f368b0da9d7fd3651ae5049/tuvexalomegudawujika.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/nodoxugemadekag.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/94864785510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=economic+census+csc+exam+pdfPDF 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_off0000bd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0E 18560 bytes
SHA-256: 433df3ceda159a64956c512a751bb61a1339b83b6b10479a1a0e5108705163fa
font_01_sfnt_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 10724 bytes
SHA-256: e009efc4b24e3172559afb671978fc6a885354ae13160bc0d088dd77cb706c15
font_02_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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