Malicious PDF — malware analysis report

Static analysis result for SHA-256 6827b9f2258c7cc3…

MALICIOUS

PDF

84.8 KB Created: 2021-07-06 20:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bc1e66fceac2e9647413b64a9cd7470f SHA-1: 5f17cc26f913531970d7355418cfe84049f6f048 SHA-256: 6827b9f2258c7cc38d677b25ec30c608233b5fa39b7f7fac4bc6c228174bc626
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and other disposable hosting domains. While no scripts were extracted, the structure and URL patterns suggest it is designed to lure users to malicious content, potentially for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://sjhrz.com/images/upload/File/sopinitaromitoped.pdf In PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40b12766a9---69434426541.pdfIn PDF document text
    • http://inphilong.com/upload/files/79528490154.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/8ablggr9j9a4tq6b5egg8c62sg/kuxeduponeba.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/74219109230.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5d0061dd---zegekasiwagofi.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/lakidojovijaximuwatu.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/1ss6ll95dsnhehcv639c8b0c7n/sewuwokofefuzisikafimew.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071e57216485---2043305646.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/wopijotiwurototane.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d41d395a6---vomumekabifo.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723b222b1bd---migegitas.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c71e48140e360b27eb26e5889e4daf22/zujovupijoxosapodulivev.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b1a67b466fdbfcf09123d13eeb5e2d0a/rutaf.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/14520666923.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/vetogumumijozipubodog.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/ropolidijafuwewiniri.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/wixalijafolixelapob.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/f1b1e4b61bca1628b056de7630f55a67/89069850740.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2afcb139674adb40622394e1e0b6a26f/vobufotizufutem.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3c118863a93f621fd2982a75dac41d5d/95825744327.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/28342580427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=change+colour+of+selection+photoshopPDF 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_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 17064 bytes
SHA-256: 8c313eafbb0259c9ae30893f0aede67bda2f3c441a4ba2b88daa58beb760869a
font_02_sfnt_off00012cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD5 10892 bytes
SHA-256: c8657c54d6f3ff1373e5ff15fe423d981a63f2fab70f29a1eae60992df2b67c4