Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bed9dd80b47ce19…

MALICIOUS

PDF

105.9 KB Created: 2021-07-14 00:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfd416011e50c6c3d591005ba06142a5 SHA-1: 283bd5c688720f5b659007b7103b5f10c4637f79 SHA-256: 5bed9dd80b47ce19070cae853545305f89ebd8175077f5731be898a684b29b90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee00577340e---94633316688.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818159acb36---dorinolasezejomepo.pdf
    • https://avonsteel.com/UserFiles/file/39667134989.pdf
    • http://mp-journal.com/media/file/9769102649.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160741854eb4fb---95980788757.pdf
    • https://hijaulumut.com/contents//files/54328990876.pdf
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/19445109749.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fe3422b0---gekoxenatajigesatodavug.pdf
    • http://applecentervn.com/uploads/image/files/seratupazotesapi.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/9h1fd2lhmqpt2n02c4ssua5bv5/gumozejerajetavokiwalov.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7883257a6b---78733720407.pdf
    • https://art-lamps-rali.eu/files/file/rerawezuvisezuf.pdf
    • http://c-six.it/userfiles/files/kowatubiwonitere.pdf
    • http://vivatbacchus.hu/files/file/99611742004.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd420c52226---36185112468.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c220ed906---tozudupavimanogonoxi.pdf
    • http://candientushinko.com/images/file/53456720297.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/rdhg8hg6ee3nu4hutrracmgpi4/tuvufezaxazujapa.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/3k4qqhdvv10j0lk451m3ba14ns/55209842681.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b119cb2b36---68397899206.pdf
    • http://standdominica.org/files/files/jetowuvevipoxivakur.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/fa2ec6ebee14f2a8eb56e7515a362a29/20891812994.pdf
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/vofekupofov.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d7ef7666f94e036f61244609664ba38a/41156742981.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/62837792625.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=geologic+time+scale+animals
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f3b.bin
9bc2281f9cf9945f72c89ed3b2548b601b65be1aca81189b3358792e8a0ea434
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3B 16696 bytes
font_01_sfnt_off00016a86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16A86 16792 bytes
font_02_sfnt_off0001829d.bin
48387cdd12b0fa54d40cdc527679d74898119c3c974f945b9cbe4e39816ba1c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1829D 10512 bytes