Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4606b2ed348d92e…

MALICIOUS

PDF

72.5 KB Created: 2021-09-05 22:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9cef91433e523278c7d5286380edd62 SHA-1: 48ad1020344fd7b5a7edb941f25a047c939cc334 SHA-256: c4606b2ed348d92ec3e65abd58d99b85867267fd5ed59065c6d1060a3cf159d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links on compromised CMS uploads and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://behbehaniprojects.com/uploads/files/xowazoxirataroxawiluf.pdf In PDF document text
    • http://airsoft1.ro/files/file/kilasodosu.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/9080546187.pdfIn PDF document text
    • https://soechi.com/userfiles/file/riwupawonudiwemomasarafuk.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/b6728407ef44a56dfa7627a462c4e6b4/92861021445.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/6830072496.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f02563d05---70433663195.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/10384168009.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ppn924jjrd68fooksv4gvchtu4/76417715189.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f2623a708---nofamowokugisenelarom.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/75ab44039565f6406ade5657ff271acf/12975512157.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/42521532117.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/gogojojavavewosax.pdfIn PDF document text
    • https://braus.uz/images/shared/file/76419145589.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/1811624232.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/53835224972.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/pepaguxugubegi.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/96252850088.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/c68307064bacf894ded9d792b953373f/47873176361.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/29477826490.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/niberudefet.pdfIn PDF document text
    • https://aspirans.com/files/file/55104061196.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a1974c8dbac---33138313858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=nomenclatura+de+alcoholes+ejercicios+pdfPDF 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_off0000b8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C8 16636 bytes
SHA-256: 82d1758a4a332097240405b2b16b631dba28839943c57c163075a4a68707d4ab
font_02_sfnt_off0000fa53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 11092 bytes
SHA-256: 3416b3688394b7092c536d24d6ee7fed57084f19805733c41c24040c622df408