Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0975cb28ba7def…

MALICIOUS

PDF

71.5 KB Created: 2021-09-01 02:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd1a3942a43bacbc82231ac44d3b7952 SHA-1: 7a2a4b21fcbabbb2d18ca4e8d0e246622419cc35 SHA-256: da0975cb28ba7defee0767c0e47b8c85c6784ded5df51c4c99e8450d1c6a72a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://okwmd.com/upload/fckeditor/file/zunebosidofotaputopu.pdf In PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e557cc74---soxabedawuk.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/7e0178c5730197b8bf7247bedb737d7d/rukalemu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076da2ae5d2c---89977394114.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/763f1301fad009c285479dd63164eb41/47243808417.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb987231b8---81986370057.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/romoxa.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160877eae3e572---menusibizujumowikimijinab.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/jr2j8gci002e2ma5el14eu7t3u/vokobaj.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/werix.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/bikomenifojogonodofax.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/64554504873.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/pojiranedovokobumid.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a9a4eadeb---wavosu.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210729_151225.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/ruvuginiguta.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec7a69d2e5---xanilezevapef.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160761621a0e11---bupegexobijap.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d63f55210---rapujujiju.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/gafuviketifezugasozirojil.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/siserewuki.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/26995373827.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/49924291442.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8b5ec9a79b6da81f4ba1b86054cb7ddf/34175946618.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/48139482628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=manipal+manual+of+anatomy+3rd+edition+pdf+downloadPDF 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_off0000b7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D0 15152 bytes
SHA-256: 5ebf87f31d31607db9951b67295270eca20f3d0f6d2bd578f0330c978c06cfe9
font_01_sfnt_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 10956 bytes
SHA-256: 270abc501f9f69b9e01408883da46082797aaf6a3634bca5d4d545a69f5f6dcb
font_02_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1