Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceac42c2caa6130e…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 01:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: fbda5565a60fac065539193b8f6850b2 SHA-1: 7e7b48db2a28855ca2fb5b14965097c671c66f9a SHA-256: ceac42c2caa6130e2567ea0c3b9e43f046fcd8ef6a12fc312ffd06266494bd3d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gruppopolidori.com/upload/image/file/31995000264.pdf In PDF document text
    • http://falerisztika.hu/tmp/19642466295.pdfIn PDF document text
    • http://henca.com/files/details/file/zizanoxe.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/gerosexupabotabufe.pdfIn PDF document text
    • http://ashioke.com/images/library/File/kagomeweliraxep.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/lubogujape.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/zexoxazimukevexolibidinix.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a1127bc8c---16133203298.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/4a87ec3e60e7aac1766579f74be30c22/34801242882.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ssfba269oahim6bdb3mp5ujhqj/95404826712.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161297137a95f3---6238603021.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/25201202989.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a130098d7d9---29092832434.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b5ff429a7a---60841511396.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/31434910741.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/459ce91512aebf10b035686eed7db646/46587465621.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/jebilofatonimigabewopo.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/197ddd2e2e64ff6a0468705ac50b1915/41392227642.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/73261c35b17a0ce695898f3de14b3894/32764607083.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609993ec83ed1---tajeguzapalaxa.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/vaxuvazi.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/rukowewonuko.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/sekunitasuvuxinojideveb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=neco+gce+time+table+2019+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_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 17444 bytes
SHA-256: 7e9bf7af2b575ab5092882845aec88458f38ff951ea3bd92f51cca444eed7a76
font_01_sfnt_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 11360 bytes
SHA-256: 7a209f44dbefbcff2f69c0a062218e5525d179c8711f352a0ede2dd597fd65ec
font_02_sfnt_off0001345e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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