Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf46f6f2c4fecae…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 08:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: afd873e734829fb14d692cd03b4d7bc5 SHA-1: 65096b11717affa4f7e521eab68cea05c96e197d SHA-256: 4bf46f6f2c4fecae1fa8182779a0ebc57bea3360a7da385353f0f259b2f65d84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript and link farm suggest an attempt to redirect the user to malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=mg+mgb+gt PDF link annotation
    • http://eikenhorstgroep.nl/userfiles/file/96808302828.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/0fa9dfc6fed60247d0e09f64a17fbd9d/10927875400.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/lapavorezufa.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/nofodojevipinanamena.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/xefixujumimigaj.pdfIn PDF document text
    • https://tckontrola.hr/files/52996060531.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/lefujumuwiruf.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea0452035a---65516251278.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/zuremezipofepaduxuletu.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/wamezotimifubam.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8de05f1e864dac2007ea7f2c3c685cd2/zadekiki.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/juwupajozi.pdfIn PDF document text
    • http://zuche0551.com/upload/file/bonegaga.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/jupekositijonej.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/gumafojukopila.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/78908751450.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/falupizupebewelomi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ccad947b---wutowinaworakaxeriv.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/xubikisoniwapegodigupe.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137427a06fe7---dumulunegazubilidax.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/24817345418.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ac30394fd0fd3174efcbc934af4861a/kexoxo.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/6216346593.pdfIn PDF document text
    • https://crv.dascalita.ro/app/webroot/files/userfiles/files/rafufepepumudavatukide.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_off0000b0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E6 9660 bytes
SHA-256: ba4e6c747b55590a25436f3d3d04f8e449584bf629d86aca5577548672410593
font_02_sfnt_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 17212 bytes
SHA-256: 06254b51a31b30ed510f97bb3367950e373b6cd86ece947276122c9d19eca660

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