Malicious PDF — malware analysis report

Static analysis result for SHA-256 0599099ccb0d3bcd…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 19:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0026a8ccce5b5e8094602e5bff42a52e SHA-1: bab4d6e8db7211bee1bde1527d276b679a55892f SHA-256: 0599099ccb0d3bcdab5147e4471ad0b91d8a2e997a1347de6d04dfea056a498b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cyklo-wellness-penzion-palice.cz/content/39431476763.pdf In PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077013585a99---segufinotojinobom.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9abe1cf113---84393899445.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1b41d1e73---99527475630.pdfIn PDF document text
    • https://airbays.com/userfiles/file/kidokutujabumireb.pdfIn PDF document text
    • http://flexa.cz/docs/file/51734280695.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/bowobodazuvotara.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/danemobijuvevowi.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608461117c471---jametivebu.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/82571de2d5dbe21b80b7aa20bd29f6ae/99843247649.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/8f6c98794409f6d702347f16ef630634/lizezanewumivepudufux.pdfIn PDF document text
    • http://teraval.cz/res/file/sifunavilidujetemifiteza.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/vuko035qpmgpl5bpak1o83hjm5/90743244156.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/bikovumitamoxazi.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/93353386158.pdfIn PDF document text
    • http://allasclub.com/campannas/file/62660579606.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/xaxaramenawufusigegifike.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/zifexawazawemojugewe.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/12762612810.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/65774061608.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/tifitokanaxaberakini.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/59049628085.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/wawoketa.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d142ca4b1---kimebivapivizute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=extract+text+and+images+from+pdf+c%23PDF 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_off0000cf96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF96 18128 bytes
SHA-256: 117a374b9fc96bb5c91b0cff8459143c8fd7351861ebcc42fb2e2a0aaf4c95f1
font_01_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001172a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172A 11004 bytes
SHA-256: d4d2369730973a4cde586e8e1941088da97827cd862208e158135d971ed1445c

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