Malicious PDF — malware analysis report

Static analysis result for SHA-256 e265b0cde65684e5…

MALICIOUS

PDF

72.4 KB Created: 2021-07-20 10:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f96dfa71cce167254d7af7ccaf515de2 SHA-1: 446a5ffb50648daf5d5ed8959579d1068fae2de3 SHA-256: e265b0cde65684e5ca75d72dbd4fb38e8663de2f968f93ae18c2110b4f11c497
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs appear to be part of a link farm designed to obscure the ultimate destination, which is likely a malicious PDF. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware delivery.

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.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/3ghc49v9vdjp7va36v5dlbf5o5/6575911326.pdf In PDF document text
    • http://krakow4you.pl/krakow/files/48959877646.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/53915164009.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/xepegavuguzikupodefu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080f91a8339c---xinijarosaza.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b8424f911dc---36926054391.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/89020779534.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/41851980004.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/64783444694.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/o7oaudj13amlebhsnflfuio9aq/fetilavasuzawoguzun.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9b6b225cf---fejokubijowigogesopik.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6a44c0587---73599921228.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/8416952755.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160872cf4d060b---zojugerevoku.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acb99b969ce---sifaf.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609af81d6439d---35719172619.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/3297094558.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160841ceac4947---25182839236.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/lipabuzuzelupilifaxij.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/61978394663.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/69458058143.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f5fad62eac1---sejoxivo.pdfIn PDF document text
    • http://wawa757.com/uploads/files/bulojitana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+story+of+the+road+ke+question+answerPDF 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_off0000b909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB909 10904 bytes
SHA-256: 8933a3677a2171b9781bc9aa93e4b5858e29c5361be457e02779a289e120b575
font_01_sfnt_off0000d224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD224 16356 bytes
SHA-256: a3e4d603b8fe7c6db9a71c94e4823346f19dfd8932c60c9075e83f5616e216ac
font_02_sfnt_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1