Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d54b8a87fa2ac17…

MALICIOUS

PDF

71.7 KB Created: 2021-09-23 10:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83a0d8637354b1ada780ad4fd3d3bee1 SHA-1: 706f3efdf91b8d5082bcaacde7b9ca2223570411 SHA-256: 8d54b8a87fa2ac17ee80b96baf0dbb896c615eae0c25f1add02962371baf6d4e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs point to various domains, some of which are associated with compromised WordPress sites, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.karelo.com/uploads/File/81759104581.pdf In PDF document text
    • https://stephankeppel.com/userfiles/file/66394526554.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/gofonexof.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109171628208410.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/gebixekerikodebarenalazid.pdfIn PDF document text
    • https://austarpharma.com/upload/files/zojoxezidiforuwej.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614334c04ef2f---tomimemelozo.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210916010659_ag8v21.pdfIn PDF document text
    • http://asqcert.net/files/files/rukesosebirelobewiwunejej.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba52fd82d3---wefegokufetog.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/mavunojenolagegife.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/94051847707.pdfIn PDF document text
    • https://deepex.hu/hirek/files/bugiwazokofebevex.pdfIn PDF document text
    • https://egca.fr/userfiles/file/77619132138.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497d25b7dce---3987501260.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/lobigazazifalidaxopatumi.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/17535218229.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/fovosojurofupa.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/65200554345.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/18189166074.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/33069539633.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347011ebc22---miwadudis.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/ruvezorutobesozigokaxuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=legend+of+zelda+spirit+tracksPDF 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_off0000b5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E5 16392 bytes
SHA-256: c5c12c531e1052e57b7271e48c2079b00e1e6eb99afb96319c538cc08aada629
font_01_sfnt_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 10904 bytes
SHA-256: 3864c115a61c50a25519140a48fb3cbf964bb0e8256b640a23ad88c0d5d7907f
font_02_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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