Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ee4cd5b58b1907…

MALICIOUS

PDF

86.9 KB Created: 2021-06-29 01:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0cb01307baed3f463c70d5aed49bb04b SHA-1: a6ef2f0ec3b9a8f6ef8012b36ae5d065ffe4ce25 SHA-256: 07ee4cd5b58b1907879d6d0ba0bfd03bc3ac97a7dd17bdc14451e98c0a32b34e
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised or disposable domains, suggesting an attempt to obscure the ultimate destination. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The primary goal appears to be redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://groupkaishan.com/d/files/35642839338.pdf In PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb251e4c4f---40023468043.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/59588605938.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/6522755968.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/bjh9m6d9h8gf89lj1mog6912n4/56707990055.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee7340c694---10927105888.pdfIn PDF document text
    • http://evansmedia.ca/userfiles/file/gitok.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607765c6762c0---11052295588.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/a5b28df4c3b0d75d7c95f1ea8afa0235/zatapumekufavazokezafu.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/tinitexotibabo.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094821677cee---bewepinejuvarijakeb.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da0b78cbc1a3b435daaceb1727c6efda/39278950979.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081178b0bb49---27152486582.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608254cfbe83e---xadoxedageliwugatu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608327536df3b---pidiro.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/fd26f7750a09bbaa622514ffe1c92b1d/62921427480.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/361b4c70cc2a3088be996f0171888a11/75961120380.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e000278f6---89557651616.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210607040243.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9992701b---54348758078.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdadd123ebe---zatumovisuda.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/waniwineriro.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/nijorivaxojowupem.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/38a923ea478e74be8e7126e8f555c1e3/wesekugubajuvig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b58a4a676---31363103952.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/funawefatutobaberupeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=1+serving+of+grapesPDF 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_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 10412 bytes
SHA-256: 392a7064777e30526c95cdbff6a130c332fc2cbb4eb6a24ecc27fd794058f648
font_01_sfnt_off00010844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 17740 bytes
SHA-256: a5aab98dd5763050dd702aabb46545bc73b18c0c44e4a8e693fdabb06337054e
font_02_sfnt_off00013659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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