Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c619d8267b57989…

MALICIOUS

PDF

85.3 KB Created: 2021-07-26 18:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8c5ce242d9adf40110060a698ef7f154 SHA-1: 12e438ee81574b1ec295e3d5a49a1df21f2cb74c SHA-256: 3c619d8267b579893ae1e4e461e15125533ea53a533deee9291ecb109d7ff738
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier strongly indicates maliciousness, and the combination of JavaScript and link farms points to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://mea-travel.pl/userfiles/file/xilotagaziw.pdf In PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe7b55a6200802d82fb0a23b3b81cbb5/vopopufepovuxawesenaxire.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/86573358609.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1624113874.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3081c0e5---wajezosoxufoxivuxar.pdfIn PDF document text
    • https://peterdegendt.be/file/xaronudixipobov.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/6c269ed1256e4ebd1149295a65c52568/molulejekat.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f64f708bc4---67041770778.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e342014ff6d30fdb9fd71513842e2743/2808233433.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/26740561538.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/33372665034.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/dosajutanesokukudotibewaz.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/5b0mqbt1ah0i7pqbr0g9rhm313/sanovamamakenonanuzeboti.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/34297816094.pdfIn PDF document text
    • http://gptools.net/userfiles/file/25739507534.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210628100817522.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a21789ecc3c5e23009ffdce31c7104b5/46448111153.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/dujujolavobubisufowakadok.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raduzozo.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/ripifidototamufe.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608aced168cb7---67780689532.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/8413638bfc593bc4dfdc0ca74b5d6bb7/85208048309.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/93278194310.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/bitir.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/46526166663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tombstone+unveiling+invitation+cards+templatesPDF 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_off0000e40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 11128 bytes
SHA-256: 1c3b495e6e3c4ebe6c157aa1d635304eb91bd050a075207e652059ba4fc96406
font_01_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 17800 bytes
SHA-256: de7d204961d3e4352fa99001ebb0e693c6d1a4ea70c4795a05d5a8266fa326f0
font_02_sfnt_off00012cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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