Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0cdda7f956853e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 14:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d45ca30584a4c65a91cf410da5e4c796 SHA-1: 4891e1ee1399ae82751e39551461790736a68a11 SHA-256: 8a0cdda7f956853e0c8a6d2d66a1122c88999314bd50e507a5d3aad4fbe661f4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ML classifier strongly indicates maliciousness, supporting the conclusion that this file is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/0c6e379ca9466f52dc629c06196f328c/72263266717.pdf In PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/e36d6954acd4fb783e85a0ee475825d1/92776125082.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c994b322e3c---lizopodavadomubinuva.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a069e8f7d5---xujofiri.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/zogudodegejisunomilitez.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ecf837609ae4a881e5501101fac3e146/kametetewavoj.pdfIn PDF document text
    • http://simonide.org/userfiles/file/74056210053.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/veludavujononebofewal.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/90551139083.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/43525336486.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/68448588706.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/59699313966.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/sujur.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/56192320014.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e88da74767---59084846576.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/tuvetosejitarapixerunotel.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/mibinuz.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161096c748549c---nezefabuvebekunesuposudir.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/662b97850c801a11d8d49f83e4bf9bea/54360126871.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/823d031290918195902fb05a05892e04/96630151234.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/revebewatigetedi.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/86225352913.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/64c3eed398d10559ef736f93d51126b6/57333403781.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3308833723---gafigukiwexurumam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=classifying+two+dimensional+figures+worksheetsPDF 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_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 11224 bytes
SHA-256: 7f6baac9deb94fbafa936106badcb352f6d5eb63be0a784f9be940f5e2c23833
font_01_sfnt_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 18696 bytes
SHA-256: 107f92ac116ff66abc05291b9947491f4178e0aa52d112c7250482830100209c
font_02_sfnt_off00012445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.