Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec14480b49ccfa6…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 21:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2636bf8573a0172867b8604f2f604165 SHA-1: 3fb0d3711f1ba661c26b4c1d7de99a0e04f230d8 SHA-256: cec14480b49ccfa6c0513e5e1d7346664554ec685629e1bce1ce08f8398b57c7
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=raccoon+bubble+shooter PDF link annotation
    • http://www.jobsincrete.gr/images/_user_na/file/rolemapinidekenego.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613828994d35d---nizoduromu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd46e6c6e7---gajizorikutarififizabat.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/53062275760.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/joxubaz.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/nudupemilagekejajuzopami.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/23991481378.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/52571730571.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/20432715568.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/57446069720.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/35409540765.pdfIn PDF document text
    • https://durimawar.com/contents/files/96746679216.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/91810454131.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/gujigodugugevamabo.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1a37ccfb0---tedusujebefezofo.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/fasebekefu.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/fawafubajuda.pdfIn PDF document text
    • https://digireg.si/upload/76404762029.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/74583694711.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/jezex.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/21348920386.pdfIn PDF document text
    • https://everestart.com/images/stories/file/76013550209.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_off0000d710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD710 18768 bytes
SHA-256: c238490efcc0caa47a29474e533e49cb33147d5869dc6fbe47c2d3b93671c625
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF5 10520 bytes
SHA-256: 8fb624a207741b3c6af6ea16d7d5acb86fbc750ead7863f96e7774ca8f40e891