Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2819a96d96a308…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 01:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5214fe516133361ec5af8f35f89629f7 SHA-1: 6127cbc02e05b273e433bfa48a285bcb0754df7a SHA-256: aa2819a96d96a308d2f346015167b5cd45d892a848e6bbcceae4cfcb871a65d7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to distribute further payloads or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=pdf+jurnal+penyelidikan+penderaan+kanak-kanak PDF link annotation
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6s54krt3fkrs8puj4vbginaed0/71665530375.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8805e94c---63653625855.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee46e099901---jenebuxefukurim.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c942502df0a---gurubuzo.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610698dd5fa22---wozowakusorufevavukidese.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210715144210.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160987732b3588---78409127146.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af040e54f6---toguto.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e18780247dcbd5fb306891b783e28207/97555577412.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3eok1qfl4ne16eg0rbiidgdtc1/xodubu.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/sopuvelevedezamun.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/wabavujifawixezuge.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89f4028e78---45866921358.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/mizevakirewupip.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jafukado.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/68096761336.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/28247573415.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/magakazavoxuxipexeloz.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/l5ug47q73br14fuuuf5cu8vnio/562318758.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/77589261333.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/65237052814.pdfIn PDF document text
    • http://th-hl.com///upload/files/vajiligiviwarowipuzodap.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/89083193305.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/ed0801a71c8a8cbbca62af0534c26e22/71490086013.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_off0000c237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC237 10576 bytes
SHA-256: 0a26dbbdb43da7fdf1423e9be97fc3fd9f3275091c2095d90df22f1caa42610d
font_01_sfnt_off0000da69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 15880 bytes
SHA-256: 5c0be80fbb915df0a7b26b40cc23f1fc1ef50a6e68969b752e677e8ced1a59e5

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