Malicious PDF — malware analysis report

Static analysis result for SHA-256 804cbeb900d6b0cb…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 18:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c3cb21add08963cd174d30a1a208df0 SHA-1: bd820505853c949f6ef490c8a777efe327de1534 SHA-256: 804cbeb900d6b0cb65f84deedec5176e1aab871ae0e1837b69e9b33bb9fb4729
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to exploit user trust by directing them to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://baltyk.recykling-rejs.pl/imgturysta/files/zofokebunivuruwodobo.pdf In PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/fexovov.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/19947721816.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/93206448707.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/bebekuzagaxupelakiwek.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/fupalezulafasatesiv.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/33093277555.pdfIn PDF document text
    • https://duvanco.be/docs/files/sizegitepavidekujaxexilok.pdfIn PDF document text
    • https://upaspor.com/resimler/files/60498291989.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/56045006057.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/44f9dge80ulbqu95pj3imi72na/11378831328.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/xolisubederajinija.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315173934df---84138505581.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/nigowowipabozovinuximad.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/zajagusulurari.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/35716260988.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc28289a0b---mimubijaxifegetuketoduxas.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/46710261076.pdfIn PDF document text
    • https://cian.hr/userfiles/file/puruxurusodojukoloju.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/nexozibobufagozoxorokilu.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/sefaxexiwosabupoxugulodax.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/tobuturitexi.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/75878192649.pdfIn PDF document text
    • http://kaies.net/upfiles/file/rebekanipedamefopowipal.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/9b7753fce3b32e0594099fc896f5335b/latari.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/94455312772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pikashow+app+tvPDF 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_off0000c394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC394 16572 bytes
SHA-256: 7c2cd56a441568be65a8dd6476a8e6ed7f77c88f1c1222564e153b6a20bcabbe
font_01_sfnt_off0000ee1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 10212 bytes
SHA-256: ea3afc2fc8c00539fd1dfda77cefff1cbd5316430677477a98b45aae59f37254
font_02_sfnt_off00010545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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