Malicious PDF — malware analysis report

Static analysis result for SHA-256 0346c1910a9a7a84…

MALICIOUS

PDF

86.1 KB Created: 2021-09-15 03:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d447353cc1baba83e224d5595d45f98 SHA-1: f472aa3a1acc0e4a63d9095b46cf614dd2193f03 SHA-256: 0346c1910a9a7a8449c7322cf37741999c8c88b8062f78d23d0b8b02d07bfdb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded JavaScript likely facilitates the malicious activity, possibly by redirecting the user or initiating a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132aa434df9d---fepebax.pdf In PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/54339672268.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141388bc8ddc---gujelipavebakefipuwiwitu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/tenemufetixiwo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edb4c2fa05---37673466808.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/pilisamusexuxujanusefa.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d8cdcd0eaeeb29f6b51525810b577a04/fedogilamukenor.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613821f811563---gekifibekanadixe.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/12254981378.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/dodexefobukogo.pdfIn PDF document text
    • https://alpinashop.bg/files/64258275031.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/vawurisulimebu.pdfIn PDF document text
    • http://grabnerestriche.at/luwifo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391f0875d31---sodoretonuxeduvilumusaz.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131ce31b3ece---lozivumiz.pdfIn PDF document text
    • https://birotex.rs/images/files/dekizuvubibopet.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/12036558274.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/26057729127.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411a9870737---zosisi.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/87352171272.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/43539977207.pdfIn PDF document text
    • http://gestioniarmatoriali.it/puseg.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/popubemew.pdfIn PDF document text
    • https://penzion-palice.cz/content/26662489146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=world+biggest+top+10+countryPDF 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_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 11048 bytes
SHA-256: f4f58ad429f6ae8d11cd58d0e708d2c83a3c711925b1ac68efae9ee95b730d1d
font_01_sfnt_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4D 17564 bytes
SHA-256: f3a21563cc058858dc28c2e488621acd529f691ed721d05d6d4f0e5aec2547d0