Malicious PDF — malware analysis report

Static analysis result for SHA-256 759e041f3661df4e…

MALICIOUS

PDF

83.1 KB Created: 2021-08-20 03:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 907b99b4f1e3faf5414f290fedf28309 SHA-1: edf37a7ec86076efc23f875bd17073da22b1f157 SHA-256: 759e041f3661df4e00fc2371499098869c033ce548d8cd053996b0680d762d6b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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://bluekeydigital.com/images/pic/file/74736341726.pdf In PDF document text
    • http://dostavkaturov.ru/files/file/97225224396.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/78743553103.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/7676855417.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98bf578185---wibexukuvafebonu.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/xagosuzo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/717511754462d6230c29be86f5d7be15/lazewidobageximuwupewe.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lmiv480mh5hro16jf24at2dvuo/46988099249.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921209bdba9---58080983896.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/92388986287.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/zopewemep.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/30708660616.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/84563915259.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/4lfffvt9h8utveivhothi53krh/rubonex.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/3f5ea54069d1b14a677467bf7bb53b58/27350765153.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/6f37d9c7aed1bebd1988222c7e413615/6932640363.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/97451251575.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/22ha4g9vbqgmhoapk09p44g797/gofozajuda.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/34005522223.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096aaa358ced---52557209150.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddaa845a3e0---96081979682.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/hv6lrvvg8ej9jqck45rp75est4/51640688377.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/70744702922.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/69027762162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bill+of+rights+scenarios+worksheet+pdf+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_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 11132 bytes
SHA-256: c17cd8ecbd35095747ff1136ecff28e3b02e8850213d456ce9c5f08d7d6c2a7a
font_01_sfnt_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 17072 bytes
SHA-256: 7bde1ae1960344780d418a3ea4651caffb5d53e60f392274453d1f0a6964e6aa
font_02_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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