Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb3952b1b8dd8d5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 02:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 439059c2b4be62651d988b09f16e0d9c SHA-1: 31391cb7d4539994c6f7cf17f4d9e0fb9b945682 SHA-256: bdb3952b1b8dd8d53491e5b547677a46b7ccbed49b12aafd5dcd409e9d4f0dac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of external URIs and compromised CMS upload links indicates an attempt to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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://crewmak.ru/uplcv?utm_term=sql+alter+table+multiple+columns PDF link annotation
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/fupigafojusivugi.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/22290807045.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/4877928728.pdfIn PDF document text
    • http://congtyvima.com/images/Download/mejizuvemanul.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5gqrgmtpocgcg2rugh5m3as2g0/88241432757.pdfIn PDF document text
    • https://themalc.org/files/file/23535236985.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/5142122653.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161254b732581b---91209441802.pdfIn PDF document text
    • http://patroha.hu/file/3690954288.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/norineju.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3564742935---95307727439.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/zoxajoko.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/fb12e2d463d03886ec58152585ca7cc8/duvujetalefipiguxitir.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/vexekewenatirevukidu.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/46471637592.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/deb459826a93733acc54990fcc2f4daa/feredugosipij.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/aa9060dsedbbol8464jm7vn424/20451258201.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf061cd4f---30368093249.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/25790432023.pdfIn PDF document text
    • http://henca.com/files/details/file/rixidoluropa.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/xulugozog.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2299eba03---gimufefevepo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6dba07ed0407c55ac17c61755f252b67/buxizimejawimemero.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_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 17468 bytes
SHA-256: f4770d9565009b776de15634992b810aad3012eb31bcc978a4bc0f7f9de68e1b
font_01_sfnt_off00010c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 10996 bytes
SHA-256: 3800443e5c6d841f7171eb9f292337f82ca3f9949dc5a0310a6d53bb5332c101
font_02_sfnt_off00012579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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