Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86eebb0919cb449…

MALICIOUS

PDF

72.3 KB Created: 2021-09-02 17:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 188f22b97aa50865a859cb0443d4b05c SHA-1: c9bb7dd944bad73f7eaff5c454a831a504d66663 SHA-256: f86eebb0919cb4497c271ae590d79a5b6203d628e2f51af0a9883d1e3580d2e1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://cructi.ru/uplcv?utm_term=phantomjs+html+to+pdf+php PDF link annotation
    • http://kartinatv.org/uploads/files/24976587345.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/bununuzunufopuburalev.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/13181921782.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/36982318048.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb82b67336---lukob.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160713307f18c0---35634759564.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac65d26a512---xoranegimi.pdfIn PDF document text
    • http://poultech.net/d/files/nizifanobuv.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/jo8b52u6s671pfpq425rg07v0j/88993402812.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/299584797.pdfIn PDF document text
    • http://dzbnf.com/upload/file///nokofevi.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/19542724840.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/343d3e8a1eec5c83b1fdff682fb7bb6e/24427231574.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/vekafavurogosuvokig.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/q7ub73qko9fg8ng8gi0scscet8/vipunuwomibememotarapegu.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/68512852328.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bfcb242da---10256484842.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/pajimagadedad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e264e7b70---11306600346.pdfIn PDF document text
    • https://nomortiga.com/contents/files/depisefiwosurarebu.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/duzakifenilik.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/daxeseganodomoguxefemuxo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f016a86e6ca---mozupuna.pdfIn PDF document text
    • 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_off0000b83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83B 10568 bytes
SHA-256: 214e8c6ea9d5196066e9674259cf0cd5c716b55b31d600a2021b67eb5328ba59
font_01_sfnt_off0000d027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD027 16628 bytes
SHA-256: 0bc0650d549d03da0286d5550a27453cae346416a91becfa052c6802513717b5
font_02_sfnt_off0000faf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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