Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d6186abd191263…

MALICIOUS

PDF

75.8 KB Created: 2021-09-13 16:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 244bce980355608196c6f8cdeea7c11c SHA-1: 7d132af3b83e6f08a8154659807622d177177096 SHA-256: f8d6186abd19126301338b929a549adc8f4402635e5eaeb735d0bbd90441979c
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a compromised WordPress upload storage, suggesting it's designed to deliver a second-stage payload. The presence of a 'download button' heuristic further supports a malicious download lure. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=find+pdf+books+online+free PDF link annotation
    • https://svingenieria.cl/userfiles/file/82766222489.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/88033071296.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/japeboled.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/12298585559.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300935032c4---gepidipesenuwukunuteseja.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/88822155939.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/78108960718.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613257061a925---kixuv.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/wemurezezilimako.pdfIn PDF document text
    • https://jjpremiers.com/files/rifovujidezizujulizawa.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/genutowa.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/gemirik.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/labugobek.pdfIn PDF document text
    • http://herbexindia.com/ckfinder/userfiles/files/ziratemomurimajutobedimen.pdfIn PDF document text
    • https://best-label.com/upload/files/88287510003.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/70046515508.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/80885886770.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/suvenuzito.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/kazuvutigexatoba.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/12539321877.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05667032d---wokuxixipusizedixinimoze.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/8925986751.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/69994392628.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/naxizodudanevovoma.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/zuxeruv.pdfIn PDF document text
    • 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_off0000c3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CD 17940 bytes
SHA-256: b64d0bf3dc66b9940df0ec55d6b12a7655f19b3e8f5eb0b4c3ecd973c9c18f84
font_01_sfnt_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 10440 bytes
SHA-256: 36ce8bc85a8d753f372bccf5e39a21df557b8c462e0ef1fc86a8be1c7e4d6c8e
font_02_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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