Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd1277953031420…

MALICIOUS

PDF

83.6 KB Created: 2021-10-25 07:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 94d6bc6bb777fbe601f81f3f89e7f2dd SHA-1: ea9c2b64ed059e42de0feeaf2d821feb8055b242 SHA-256: cfd1277953031420b806787b689e6b9e8347a2a1da7d19c8d8b8b5e36d3b2695
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://dentish.ru/ckfinder/userfiles/files/kafilu.pdf In PDF document text
    • http://ch-yang.com/upload/files/61149969149.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rqd8b60v4ju1iks9qjhoe7h5r3/pironipudepulugerineboziz.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614888e814af0---gimewaxazovezuxow.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/babopazulejapelupofekuf.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614196b6c432d---gexiw.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164884092615---kuridirupatupexilo.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/kamuzokakugimasa.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/paboruzavixewulefun.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/gejuvosuxiw.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/tokup.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/17932784006.pdfIn PDF document text
    • http://castel.lu/userfiles/files/43278927246.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/91003579371.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/pivozuwujoxa.pdfIn PDF document text
    • https://best-label.com/upload/files/xasubuvibetawepop.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc662649f4---18131215930.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152b2e4aa6c5---42649220989.pdfIn PDF document text
    • https://redormiga.org/sites/portalin.es/files/file/jevurafobedudexifira.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/zexoz.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/robemexofobusekepu.pdfIn PDF document text
    • https://renetravel.ro/images/files/ronijesoladelanufiga.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/16499917014.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=190+lbs+in+kgPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD76 18052 bytes
SHA-256: 4da59f4a68d9483a22ec0e629ecdc27f14417d277718a140fffd57ffdfd255a9
font_01_sfnt_off0000fc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001147c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147C 10148 bytes
SHA-256: a1853ffea3cfd77969570b8fbcb8891268325dc39c7c7be628c35346dd9eb411
font_03_sfnt_off00012b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2C 16108 bytes
SHA-256: a31e141fb2917ac6221449cb8c95e700680d048453672ad8ad57cd6853c5c53b

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