Malicious PDF — malware analysis report

Static analysis result for SHA-256 630b04dbeefd8e38…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 12:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 0984816d33348f848ffd719eb44f60a7 SHA-1: c61caeffe487d65bf04e6aae97e8e9877f9f89c1 SHA-256: 630b04dbeefd8e381e9bef1ebf305c20c14aa3f3d85c7a19ba5a937f12a36974
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee03febaf6f---lexagatodadupuser.pdf In PDF document text
    • https://imaggu.com/ci/userfiles/files/43682912268.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/89347841535.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/vofalusuboritez.pdfIn PDF document text
    • https://dafelia.com/files/samuvet.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/14468665529.pdfIn PDF document text
    • http://dogable.de/userfiles/file/fowusezewemoveneb.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/6680ba7d849e4a1364c7e9f23e3fd9f0/nomezewefisup.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c5c32fd73c58486e82be847d38b1537c/mipetafatugod.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/46541280258.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e626e578b2f35d582b6f2f0d724727c5/linuxenujomuviw.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/1olkoqqpqe0h6umbv4ueied5g0/18571254522.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/83071650440.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cf880991c---kekozupasafal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ce127f168---26314111667.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089d5d4540a7---40512968991.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/lirojebojifakewuda.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/gatonowiw.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/42084307137.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/selemadomisut.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b83a0b3ee62---dokusemanegug.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/kakatumusos.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/73405264412.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/94284635015.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/39081478385.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/83299658251.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074112838d7f---26953278406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=honda+foreman+hydrostatic+4x4+500+manualPDF 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_off0000d4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E0 17212 bytes
SHA-256: 084d0742edf9bd210f2cd71d8eab154769ed17b5ae40f24e4f5018d9d0a0c1ea
font_01_sfnt_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 11380 bytes
SHA-256: 411515106e9bfa89dc78c5845e3b4fe45f74842006f1e9b16dc6d776247080e4