Malicious PDF — malware analysis report

Static analysis result for SHA-256 5777962065eecbd0…

MALICIOUS

PDF

78.4 KB Created: 2021-09-02 23:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 28d5f4fa06d974d4e0e2cae5bab337de SHA-1: 464bc4bf4813ae42906528dd8ceafffe2a641abe SHA-256: 5777962065eecbd05d01b0daf5a93e487cc08c1b8e367c336ad1f6c30a19ac47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=word+to+ppt+converter+small+pdf PDF link annotation
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acdf69e589e---famox.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/godapudim.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/zadolikodavojojetetu.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/71647574315.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/17219982963.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/33319382975.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/3837373489.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/zagojusewefemalegiwaja.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f69fffb7856---sewuluzuwemorususopax.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/nugulomuzuwo.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/13nvf9dgb80sdbl0brdgau2nk3/rivasubelesuxuvuvegegope.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e1e84028be6ca9f1036d408bd35718db/85243991508.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/gaxodabowe.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160cafcbc10282---22140225182.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/piveramubedexevulawa.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/6416983086.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/dojijaborugig.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/88995316671.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607257e74cd69---22710485442.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/sijutaxuzimurajawe.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/bikowizatuwetowezaxedabo.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6a78c42addf0a4bcf7a5380bf4fb2d0d/wesarolan.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/gidetus.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608254cfbe83e---xadoxedageliwugatu.pdfIn PDF document text
    • 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_off0000cc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC33 17832 bytes
SHA-256: eaa15291520158b479fbe573ff3278bf8a02ba73a3fc0afdf8e621ad1daca1f5
font_01_sfnt_off0000fab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 10748 bytes
SHA-256: d03e303531e0102f8e80577ee56d6134f08f6e8483de5d4453be397d917ef705
font_02_sfnt_off00011370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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