Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdf92a0eac9ef72…

MALICIOUS

PDF

102.4 KB Created: 2021-07-08 09:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 181e11332996fde31c32cdee69691878 SHA-1: ceccb23cd967f993ccac61cddc55c2056fc844e1 SHA-256: 7fdf92a0eac9ef728dde574ad2a6300a77f16a42c66824056504955539b0ae7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating an attempt to host and distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/1i89rej9tsngjqhk538ldg6mh5/dinumitokumanudo.pdf In PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd0587c91751943eacc322f372ed74bf/76473314398.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///94989139782.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/42095bf26287bcadbccdea62c9bf89a5/xunesopi.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/jusagad.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/46950991238.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/15626013625.pdfIn PDF document text
    • https://melz-feu.ru/upload/46591557243.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eaf6dc522---wigarojijutanitaw.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/dd3768fa619470bbd0194bbe087f6e97/tugaxirabarazazomozepozo.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/o7ev0964smh5mjv6oc6lsm9bl5/vupumozutokitaxojomu.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94a5bbbcaa---32629549141.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/44099617057.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62e0e5adc5---jetevujujola.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/ruvuxi.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/d42bed708a813594416affbe74466548/gudawelokirevapu.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e3e6f1293---wumadorewozilurete.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/pimamamewilaludolupifa.pdfIn PDF document text
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/34792906319.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/zenuvetitujesite.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/k0hnoa4qesd57ofp2ofs551603/15799093243.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/lijinibor.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/90aff1603e994a25451962844dba5941/jijelijisufazida.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/37488994733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+use+a+wedge+simple+machinePDF 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_off00012b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14314 18124 bytes
SHA-256: e0f19faa1eafb6305d46a093ce0a8ddc957a48c52b8eabd13fefd609f20864ab
font_02_sfnt_off00017299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17299 11036 bytes
SHA-256: 4cb0053aca82d8f636d9be33c1ec190875bde6ce3f9aaf3ca0d2a199569ee968