Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c49a1ba703912b…

MALICIOUS

PDF

71.2 KB Created: 2021-09-09 18:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b3f7658487e7a19d89e2a02af121efa SHA-1: db14ff3b40a9bc9c1d383e188eec77f9b8bc5d55 SHA-256: 55c49a1ba703912bb40efc0289125fbf6309e7e34a0bd220f0fafeceefa305d1
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier strongly flagged this PDF as malicious. The presence of embedded JavaScript suggests an attempt to execute code, likely to facilitate redirection or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://seasonsblinds.com/uploads/ckfinder/userfiles/files/lebirefapobokukesosiwu.pdf In PDF document text
    • http://vikingpaint.com/user_file/file/pafola.pdfIn PDF document text
    • http://thevalleytrader.com/files/perewofifusaxejozexasi.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/jepopunipipetewabatapaji.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/jewodarofutov.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/46203491159.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/77793106903.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9888c257b---piwimow.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/lililikirazezes.pdfIn PDF document text
    • http://kaies.cn/upfiles/210908182825272930p1kwgm.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9592519a2f484099d3bdda68a832d019/ralomoreg.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/fajunojefet.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/44616743710.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/fefegitozijuwutaxuwaki.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613197a470342---kigapidomesigetijeg.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/moresuse.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/jamotibexonumomitavozi.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/86576025984.pdfIn PDF document text
    • http://mariancozma.com/_user/file/xidibudomavilarewesewim.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/pifirotojitog.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/sologesosemizisu.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f651b161---36301463335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mandela+tamil+movie+yogi+babuPDF 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_off0000b59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59A 15980 bytes
SHA-256: 11f0093ae25652bad262df786b93c84e86d14879934d9c9b9a5e550c76c42f4b
font_01_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 10736 bytes
SHA-256: 8d0400d2fe025e7eb285dac549bcd642da29d7413c48d6a7ad5ac659d2e0e2dc