Malicious PDF — malware analysis report

Static analysis result for SHA-256 683b9fe8e7fdd86f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 09:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4fe14cc268e221e3e1bf4ff7164467c4 SHA-1: fcab12aa5ab115e3a23863bedf19a7f5e7a30f1d SHA-256: 683b9fe8e7fdd86f5310d90399cdc791a3d34f90f91545932856565408717380
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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 http://dietmoiquangle.com/webroot/img/files/91407681545.pdf In PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d12428dbd29c8f4599418a13d938f9be/birozevosuri.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2fc5710873---52753026595.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c54f1bac630---72462787326.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/zulilodog.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/75212987665.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/38720817283.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6be3e8356a---takivipi.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/dubexabofidug.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160aa227c4b7b6---42111896789.pdfIn PDF document text
    • https://thepainter.asia/upload/files/marepuwenon.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/fitasenodivifof.pdfIn PDF document text
    • http://soles2walk.cz/data/file/67007922144.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/faroxonaxubad.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/duwanuleludoxakiv.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/26474899173.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16120eb86e7762---16509040776.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/63171000296.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/nijij.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/14b7fda01d8abc494d1dd07a2e1e3aad/gujemomaz.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/18969572884.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a67cc4ac---gotax.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/50848991007.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa5cea3513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=international+politics+art+jervis+pdfPDF 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_off0000db34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB34 10760 bytes
SHA-256: 0601c567fce6709471d6b20da04b6a458a7c1b2fb72b23ecf0fe431de2c7be12
font_01_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 18152 bytes
SHA-256: bf56cbc685dd75c71a9feb1bf7fc956eaad507aa6e0916ce9bbd4193d0c76066
font_02_sfnt_off00012347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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