Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0776ad2d61d461…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 15:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec3d9dc4df224e21e2c9acc682a922ed SHA-1: 829144053c64c61f17e0d1efbcbd6e1ac71d3033 SHA-256: 7b0776ad2d61d461ff56d56670dbba56c25e0a6d6640409f3026d7c8d0213c47
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or redirect to malicious payloads. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874223b217e---25898872554.pdf In PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091ec45ef943---nozebitubunuxuwujiku.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/fabedenomevon.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/32026509044.pdfIn PDF document text
    • http://mcutech.net/files/pijinedonetejonetuxexa.pdfIn PDF document text
    • http://midel.me/userfiles/file/60496114348.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/tqngvem7vbm9q8pq7ee6c1mjch/munobuwum.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9c9d18cd5d0421a42f1b4f8e29cf042d/35056521507.pdfIn PDF document text
    • http://glttek.com/userfiles/file/95143442740.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/feb7aa02aa2f2a630035e25225d74668/wajatojomegosuva.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/xonafag.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/84182924626.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/48447371043.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/53209148575.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/08/06/file/20210806_183724_102.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/edf2aa1c702b7d33b8330a0fdce78966/xavezoxebogojupa.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/31469297412.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/3a75c94ff5af6d3468b605fa6e61fc34/72185919725.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/feposazesowutizebipenipiz.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/mufubo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d53e295ab---85337165764.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/kefimutoseni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=4.1+climate+worksheet+answersPDF 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_off0000bb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD390 10772 bytes
SHA-256: e5dbabc1d910c13f7a42fe999a143748a27c18a96018bf375c5b5fcff91b44dd
font_02_sfnt_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 17200 bytes
SHA-256: 22c7a907ca4f38cbdabd0f796711d1483cd16078267329dafbe267057882d169

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