Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c491c6f634a49a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 11:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 395df1b099497a818e8bec09fd2b9a1b SHA-1: 99dec222340b93595fd27982e04fee756d8b2b73 SHA-256: 56c491c6f634a49ac62cf02cc51424c61913a7c65f5d6f88de5f2c1562be4a80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://yearbookplus.com/uploads/ckfinder/files/64264491511.pdf In PDF document text
    • https://lordoptika.hu/files/files/gibutolo.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/jeturimimadamodet.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/toladogid.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4d62a046---91598096078.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133461d14323---fiwagaduputukofulesinet.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f88c049cf5---xinarofifome.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/41138141380.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/vinatinewipipojatidajov.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/sagidexuj.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/48099358662.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/nojorafumalupumuter.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/bedugutezanapurara.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613653e776e97---gitomokuwepup.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbbfb6fec---28364018638.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/f101rr9ssqt5mjp1el5sf8un42/16700522742.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/jepiwosadaxur.pdfIn PDF document text
    • https://norservis.info/files/files/72762202324.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/purasakuzunamazetiwota.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ec87b922---norix.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/36786430055.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/fobalowutovunus.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/jopuwekir.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/kuritajutezene.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/rokipalanubutopoka.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e43ac4fb2a---96978597532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=delete+android+messagesPDF 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_off0000d2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F3 18748 bytes
SHA-256: 7fdc55eb7a388eb7bd6d1ae142051b2b4ce3dcfad3857e2bc4c024bfcc8e579b
font_01_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 10592 bytes
SHA-256: 165307132a4443c5ef99950f8d3997cdabe88b521d080cc11db7b08a14ae6b6e
font_02_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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