Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5136a42cb7126a3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 15:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37fa54b470899aa2b6fe1905867a6076 SHA-1: 1a84df202bfc78ced2011694e65795c5573714ea SHA-256: e5136a42cb7126a3ca93f5a6d05cea473663a32453f7e948643ca087dee5739a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites. The ML classifier strongly indicated maliciousness, and the structure suggests the document's primary purpose is to redirect users to potentially malicious content. No scripts were extracted, but the link farm itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9882e5d5c---9317059740.pdf In PDF document text
    • https://lexcyberia.com/userfiles/files/mosarilufokej.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/puxogazowezutarinitugud.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bd8ae6731d---92974235360.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/1c8d4cd5a222f58ce35d955b76bb4927/56623631620.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/npqs3ccfnpri38gp5hj0oc03fu/45123210347.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/26250240680.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6be97b050---25154716520.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/vowamepojobix.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021080100542786.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bf352b05a---32426696971.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/63257665560.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b2feadaeb41654a98e755a1e9fabece4/juramaxinezabemevita.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/q1h0408vu2oukg7jc5g7j1m4cd/22384827305.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/96435453000.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/xuwimapewikeluv.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123a1f38d9af---65639896404.pdfIn PDF document text
    • https://ivanamihic.com//files/galatuk.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf282634a1---72306126469.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/75903521760.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/73230160459.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa78321127---92995451053.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/15164202984.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/1aa1343638ec997f20413e5c61d9d826/1556506974.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/nirudewinalarenediren.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160edd29d48eac---10877481221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=clinical+ophthalmology+atlas+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_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 10980 bytes
SHA-256: d025f03e3278d9420b3906b862ca8e614200f06bb710caacfd65108e290ee005
font_02_sfnt_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 17936 bytes
SHA-256: 6c0af05a4f6a91d12c9396449cf6cc50d93c22d4a061bdaaf766fc1446e51ec2

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