Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bed293a7f9f051…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 05:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4d316e1d61e8f30c374c79a5dbce64d SHA-1: ad1bbd859389ad54089592e84eee803a26eb4c18 SHA-256: b8bed293a7f9f05178eb784ef1132882b965b3a904c000a1196c88924bbaced0
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be associated with compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' lure further supports a malicious intent. No scripts were extracted, but the primary function appears to be redirecting users to external, potentially malicious, sites.

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.
  • 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://irlanc.ru/uplcv?utm_term=app+locker+fingerprint+%26+pin PDF link annotation
    • http://xprchemical.com/upload/files/bazeladenupobam.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138901603f87---87743156018.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/wegenumefuzesogexebolose.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/25720257285.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/dikimogazorasaj.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/92104541141.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/28264915227.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/91100937382.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/aj59ktji9hfp2at16hg1nsadkv/88407641872.pdfIn PDF document text
    • https://sinarwaja.com/account/files/31691863326.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/67589016910.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/zofawejasatatuv.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613352141092b---39945313414.pdfIn PDF document text
    • http://riph.pl/userfiles/file/3795960207.pdfIn PDF document text
    • https://ntc-container.com/upload/files/verupite.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o072p4p05gl7bghcltqiujtbc3/dinekewinasu.pdfIn PDF document text
    • https://mahae.hu/files/files/gijazadu.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/xezexonijumutod.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/656938516.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/81918446544.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/dituxebafemuvorozo.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/75547970232.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/63736472059.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/76961682240.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_off0000d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 19152 bytes
SHA-256: dba2b7be74f08198d11ed83efb58f0ad060d1db4be0273c83554248cf5c0937c
font_01_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 10396 bytes
SHA-256: e46a046993e8a9b9f6788a58d88c2938d23aa38c63e3e62655565fdae380f64d

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