Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26174b2a9726d38…

MALICIOUS

PDF

73.9 KB Created: 2021-09-26 13:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b83dc2359eea58f8919847bbd76a546f SHA-1: de9ac7adc726b22e75222a5e2521f11f1fab39f5 SHA-256: d26174b2a9726d3863653d68141214300e81bad1a0d41176d14eb745ccc50576
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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://alusol-kw.com/ckfinder/userfiles/files/kepulesutebuv.pdf
    • http://wellfoto.cz/pictures/files/51637946405.pdf
    • https://caribemed.com/userfiles/file/rujobumomutejezerixilegu.pdf
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/sopob.pdf
    • http://terezmisszio.eu/files/file/soxemawuluderopuw.pdf
    • http://saint-party.com/media/file/22937397119.pdf
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/kuwuferirigapaxabasunumuv.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3d20d9b71bd223bcefa4b3c4d8259dfa/sajobetobulaxulepukagejuk.pdf
    • https://hiperaktivite.info/userfiles/files/kinexirapaguxevodibubape.pdf
    • https://xnkvinatimex.com/uploads/files/ledowefavele.pdf
    • http://kondicionery-domodedovo.ru/upload_picture/file/47169190424.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f21bd19ab1---keputowezimin.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/r587jh4tpa0si9atc9qc0l9nr7/repotazoli.pdf
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/27947997883.pdf
    • https://alutat.com/data/file/60703797739.pdf
    • http://www.supair-lux.hu/ckfinder/userfiles/files/kiwufutusefejonaxozubizal.pdf
    • http://dogable.de/userfiles/file/watapavokik.pdf
    • http://www.examnotice.in/uploads/files/97342452263.pdf
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/begedivewazetimaxiwikagul.pdf
    • https://calendarsunrooms.com/userfiles/files/43201295952.pdf
    • https://efsanepin.com/calisma2/files/uploads/97867618543.pdf
    • https://aprilboya.com/userfiles/file/99979869217.pdf
    • http://birizgardenhotel.com/userfiles/file/22270344206.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=el+diablo+de+la+botella+pdf
    • 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_off0000bcf6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF6 16792 bytes
font_01_sfnt_off0000d508.bin
d0c81596567a7ad98e7144a35f0a3e5f62d38a4754da44e9c5384ffaa9f96f4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 17828 bytes
font_02_sfnt_off00010321.bin
5294867b393eef7adc88978ab6cbe1601b224d5cfda0f69bac8096c83c269109
pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 10240 bytes