Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5ff942c5491359…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 14:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f222cf5dbd9f3a173daf7db346a54241 SHA-1: d443cffbd51542e9e280371c5f8662f60849dcca SHA-256: 4e5ff942c54913594828477f2b93f379f203f84dd7391992678a04195bd550b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The document also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating a phishing or content-luring attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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
  • 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://frigosztufi.ro/ckfinder/userfiles/files/kixokumovuso.pdf In PDF document text
    • https://netiko.ge/img/Data/file/wetipejaxisexemebirifeb.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/41578606452.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/14336838583.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/aafee1a5c2c2a52740f37cfcd7dd23f8/50413769561.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86697da9fb---vazogadanipeborolire.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e4d1d9bcf5c8e4a00e31b244e2895840/fosod.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/74501624696.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/mogubebawi.pdfIn PDF document text
    • https://led7.ru/file/fewoxuxikuzixapijemogik.pdfIn PDF document text
    • http://sukhabalka.com/files/file/79831689950.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f687bc527---nedidirefevu.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/58323327957.pdfIn PDF document text
    • http://starsunited.at/upload/files/pobuxunopusixepebedit.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160942487096de---zeduniwadarubaj.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/35048222569.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077f461e9bfe---85859885690.pdfIn PDF document text
    • http://muszempilla.com/files/file/59824419624.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ppuv9a2m8i2vcmlb9qf9ckg3mv/20709331119.pdfIn PDF document text
    • http://capital96.com/userfiles/file/91101917103.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610af8014cf76---26643524396.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/29186113681.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/vimagafidafuzifewafejew.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/87859654627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=stop+on+goPDF 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_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 17284 bytes
SHA-256: 630d9811e7ca39feb37a3194d16c6d790235c6972e47173715bfa9b3732abcb6
font_01_sfnt_off0001142f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142F 9804 bytes
SHA-256: a0eca22393daf04c69ce009bb4eb48f5b1ee75e0394e6bb12c3eda895fdb0cbe
font_02_sfnt_off000129ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1