Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70dc1a7163172c5…

MALICIOUS

PDF

78.1 KB Created: 2021-08-24 22:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0dcc886d42e8e3fc562a3c0b6a6dfa97 SHA-1: 1bbb49e1733aa1a4ca9dd5f064f72e407ab41db9 SHA-256: a70dc1a7163172c561626c192f9c903a3582ed7cf0f8b528b9e8c8199d81b3a3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised websites, indicating an attempt to redirect the user to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a downloader for further malware. The presence of a link farm on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8520

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/955f1eb504c79321143a4707608d3245/88989274293.pdf In PDF document text
    • http://minhledtran.com/luutru/files/35853112572.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/261ile390a3ssq201duhfkl729/gotoxisemobovugulo.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c569f1e3e5---gavep.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ebc22a8e104d793da965a05eacfc39ca/95215536636.pdfIn PDF document text
    • http://stevis.cz/files/file/vibatoturu.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/5596773110.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/79036248052.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/68544994004.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/f6d3a6360c2b137daefcfd0984fb527d/dixuwesozuzagisa.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/lovav.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/3cace069c37b9c83b2d846e6ee2ce67d/niripi.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eadc6a84cb---88786347631.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1611848f0686c0---19812357374.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/70754441283.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd9d878bb4---83128096290.pdfIn PDF document text
    • http://short-story.ru/upload/file/guvula.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c14d054f16---nopizomefisufaxibok.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f095f65128---jofejelemikowodetedif.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b284e6341---49672158030.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/798tlp3rbt76ifuu47h7fl0vjb/zaxuvul.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b37190e7e---40744487793.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/kisijamulenakege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=all+accounting+concepts+pdfPDF link annotation
    • 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_off0000dc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 10776 bytes
SHA-256: cdea460160df5dc5fc3abd381285a6871b41cc851266c0ed7de538f89f2f1ba3
font_01_sfnt_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 17080 bytes
SHA-256: c09faa278ffabdbf2cede54797773fabd4d1ddb32cf5df0fa7f7124cb182376a