Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e285ad8636537b…

MALICIOUS

PDF

75.2 KB Created: 2021-09-08 04:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 59f0ef0c7567966dbeb97c6f950f0469 SHA-1: eedf489f5c258a019b8eca1b9c5c014b0d9be912 SHA-256: f7e285ad8636537bf0f61ff03c0edd851ced0ee1ba6c74c37c87e73d8e98cee9
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains numerous links, many of which point to compromised websites or disposable hosting. These links are presented in a link farm pattern, suggesting an attempt to direct users to download further malicious content, possibly disguised as a passport application form. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://print-printonline.com/ckfinder/userfiles/files/92441804745.pdf In PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/mamogajefopamowulazekuba.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/gupokofir.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/96019030410.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/lozugetozewogujogodif.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/3439003567.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160848d4755086---xasonotonevidoxinixozene.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea4b55793---gigisuvekulutolu.pdfIn PDF document text
    • https://hssanesteban.cl/files/joluvisijedi.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/mopoxojenofelivinowuved.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/qd71nug0k6jkjd1bslfa3jpk3l/73884239048.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc5dc0a6d---losizada.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b86c85678ec---polafe.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b8b84188f1780ad000c4c64c6b73470e/97671040402.pdfIn PDF document text
    • http://maihome.hu/admin1/file/gunapulagixu.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/tuluzutujimesaguvoti.pdfIn PDF document text
    • http://cooleywestbrook.com/clients/865832/File/86512271232.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/39346063287.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/23307754942.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/nutuk.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/585130164.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/nelibepejiribixedepan.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f24d777c4---bigawixerujedi.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/kiborosawuz.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/lepebedazutotoduvumofur.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/89806510537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dfa+passport+application+form+pdfPDF 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_off0000c37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 16640 bytes
SHA-256: 99df0728ae5cdb8a05fb996e9bdcc757630722aa4844fb2109ff720e0c142c4b
font_02_sfnt_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 10652 bytes
SHA-256: 0ec1c9c009065a8ac1fab68fd7861e4a193e19c1ffd89ef558e46b3d639b3e53

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