Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1611cfe4db9cff8…

MALICIOUS

PDF

81.7 KB Created: 2021-10-05 05:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7569bab7aa9d6cdcddeb30cdb1be7723 SHA-1: e6f3b0ecf2a38eeb29e0cc561f32270ef2fad961 SHA-256: f1611cfe4db9cff87c65cceb953461897e3377a5b3b9a6550ea8056248047f45
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish credentials.

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://u-spot.biz/js/ckfinder/userfiles/files/93529177302.pdf In PDF document text
    • http://skolky.info/foto/images/file/jozew.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/51168158058.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/timigodowokirigo.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/mugoxopunolikapiw.pdfIn PDF document text
    • https://samudra99.com/contents/files/60488326713.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/41887659508.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/mulojiro.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/mebimebazubus.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/lilijarobogamuvo.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/nomiforobilomawakoradax.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/86923657529.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140dddc667ba---1682951969.pdfIn PDF document text
    • https://eniedu.com/data/file/20210911032604.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/5206657c7b71cec5a934511bbdc29aae/47521370020.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/xopirabujibulabebemer.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/69473637790.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/64572142315.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/80783213001.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f32b4cc64---83227662123.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/kixotuvokamolasagut.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/47983943675.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/27620813974.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/22545846536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=chemical+laboratory+business+plan+pdfPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/zekidijixinub.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_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 11268 bytes
SHA-256: 0b0458714e44e792ae4c3d34ea40669be5203c81d8323bb9a4e0229a02e87ad4
font_01_sfnt_off0000f112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 18292 bytes
SHA-256: 3ecc538b74741f5bf6d911292a2540493d0b6cd19f143936a82b323368012dca
font_02_sfnt_off000120e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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