Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b93b34e2c8371b…

MALICIOUS

PDF

98.7 KB Created: 2021-07-19 20:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f8a78c0536eb280b18d32e3da08a16c8 SHA-1: 6ef3cff1b267fe3a5342e165f6532df9a2f93e5f SHA-256: d0b93b34e2c8371b601db6eff60bb8713bfccd805c0d2f88b5c4bfda2f9964ff
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. This suggests the document is acting as a link farm, likely intended to redirect unsuspecting users to malicious content or phishing pages. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9785

Heuristics 5

  • 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://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a3a09ad3---58458326648.pdf In PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3da593b3a---3966373506.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/49656324554.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c4663b379---werodedanetizapud.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qm7l8h4f5hkjtmgvtsu60kbv32/50272713430.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e005a9b5bd0---zixebifidirixefepenapalo.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/voxeriregozolorugig.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/904slf1ubkj0cfkq54qnbje1gi/gomol.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f2bc812cb---62095350872.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e2d4343fd23e3744fbb67c80f01b8e30/54714110843.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/342b6b34212938b32a4cb2bc7dec2f27/pelofalojivik.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090e6a2e7eff---547303499.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084d22dc5623---50834221037.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/88959293c0476a05cbbdd807f776d9cf/95944732176.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3ec0ff19bfc1d27d8bb25a0280272946/lebexisanofuvumugekuveb.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5add213a---57064557177.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/25351485dc9d80179cef6fe43d5bdedd/32055696133.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae46ff9a32e---jikepevosar.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/902vat73jq282sfa9ti1dpbvm1/82523281832.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/72464613895.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/dojap.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/mr2dkoobpn4s9mjpgnho24ncce/24750760132.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160948d927c96b---60989968037.pdfIn PDF document text
    • https://ivanamihic.com//files/45428904921.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee81018ab3---xofaxig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=baby+river+otterPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 16920 bytes
SHA-256: 3d295bca9ebfc11ba2bbbb4ac2dc921829a888634ffbc45d2db8166bb6387dc5
font_01_sfnt_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 23164 bytes
SHA-256: ccc6a58f7c6929a715936aeebfaa756e87e8c42c27c49bc46284873879036be4
font_03_sfnt_off00015891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15891 10156 bytes
SHA-256: 818fb6541f6bc3a5c24b544e3d324544b1b512acc865bf4a6a052cdaf6161144
font_04_sfnt_off00016f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F77 2892 bytes
SHA-256: fd23a5e40ef57a38e085a1c92430c7f5bfb5790d70fbcbe5c0f2234b9c3161f9

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