Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1724749dc06f50…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 15:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f127f13096b80ee2a842adbfe9e8cc8 SHA-1: 4c3617c9d846825e1a3bf616b45ddd90c68666d8 SHA-256: 0f1724749dc06f50fc7f01570cb32184075eee6cc8741b4687b48d8e2128739d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains embedded JavaScript and numerous URLs, many of which are part of a link farm hosted on disposable or compromised domains, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript points to potential exploitation of PDF vulnerabilities for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=warzone+free+cod+points
    • http://leeharringtonhomes.com/userfiles/file/63160579238.pdf
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/nipaxitoz.pdf
    • http://reliancefla.com/admin/images/file/vinolabedodonugisosij.pdf
    • http://scamps.biz/userfiles/file/monuramatasiwav.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/mrfpq62b1omjrq3sr8gt6gtbm4/50119398476.pdf
    • https://otoform.com/upload/ckfinder/files/16926700120.pdf
    • http://www.kickcommerce.com/userfiles/file/94212958183.pdf
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210905152715.pdf
    • http://darslaska.org/ckfinder/userfiles/files/41307086670.pdf
    • https://cgeminfos.ma/upload/file/59140260223.pdf
    • http://pxmonastery.org/CKEdit/upload/files/tedalakoxarekupiwin.pdf
    • http://starinviter.com/ckimagefiles/96292384617.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66fb107a9---gexuwoxezitokafivawab.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/rubuti.pdf
    • http://etkindenetim.com/resimler/files/8662636982.pdf
    • http://timandlor.com/userfiles/file/saviruwefavepijomefotog.pdf
    • http://panda-es.tokyo/yamituki-n/uploads/files/10216254900.pdf
    • http://domainecomps.com/documents/files/rosar.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/eefo01v13hsuci5a1t4ivfrgog/52085580446.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/15711345969.pdf
    • http://posicert.com/upload_fck/file/2021-9-9/20210909015702382620.pdf
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/97250458000.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332f2948816---62108207235.pdf
    • https://beamstraffic.com/amb/userfiles/file/mesunoxijurifebabivudej.pdf
    • http://indianmailbox.com/assets/images/userfiles/files/diromofebirapeb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7f8.bin
08e341d228eb94f1523e40b2dcb90efb046d89031d7229ea791cf6712c333f0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 18236 bytes
font_01_sfnt_off00010740.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10740 16792 bytes
font_02_sfnt_off00011f57.bin
8809cb158a87f61aead0faaac07b3c5d4b295cfa1cf1537aaa2ac22fc612ef0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F57 10620 bytes