Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4451aa72eb6133…

MALICIOUS

PDF

78.6 KB Created: 2021-09-01 16:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e3f615724625187aa6d8526d48632cff SHA-1: 1f7e4190a4a143109a13716c372aaa8aea9b864a SHA-256: 0c4451aa72eb613319e6526a75230b3f01aa566c709b31e5953c0a3ffb3d73b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=the+secret+society+of+second+born+royals+watch+online+free PDF link annotation
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c891130d97---68416156140.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/19906179976.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/53140955925.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/9353960659.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/70083390881.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lnfkubt5hmm3lm9iv6db9cv797/86203860415.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f300b00bc30ec6e96eb681bf13c7882b/wovubulakoxibawazekexij.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/gunexetajolugisokazigemal.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/cb89b3e22e706797f5694c75cde760b1/fapejelasanisidazumupa.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083261784a44---pavoxez.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16128e98848ee8---valinom.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4958c46a12---pogimizegovawateragoreko.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d9044bafa---nigadedokiv.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/tirijizomol.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d88f1f93d13---59824882790.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/titedebesetesaful.pdfIn PDF document text
    • https://nada70.org/userfiles/file/wusalakizuzemipaguko.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/84974572257.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/sebajel.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/wibumodilakikezegozarugov.pdfIn PDF document text
    • http://tcihk.com/userfiles/34473838147.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/49087273968.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/pididimipirarolakoxidufa.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14681926714.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/warasabediwa.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_off0000cb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB44 10876 bytes
SHA-256: cac340e8f09e3a3d8f57374208765e155a2635161cb10cc14df598ba0bfca3f6
font_01_sfnt_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 17432 bytes
SHA-256: 111db4ac17c2998959f3d266ee065c0395fd1dde7b9052aa95460eef6552c249
font_02_sfnt_off000111b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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