Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8243fe9d9f79a19…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 07:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bcda407fbf35b7e84067067ef516ac43 SHA-1: 531f1f961ff6a1e2c4f7218ef0d34016e22d39e9 SHA-256: f8243fe9d9f79a19797b082c21ddc605abab2f1a271d5080772c7db58b2f2d97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous external URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=n64+emulator+game PDF link annotation
    • https://ccaquebec.com/userupload/files/suvopujerevalow.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e0b7dd3a0---xixetuxav.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/lisoguwejobosomojinenov.pdfIn PDF document text
    • http://intertribo.sk/files/53718777172.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/37078805790.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd3ebade7---64526160739.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/42924979792.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/tudavimapapajiwesodatevon.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/pinonorumonopowal.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/53372004854.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210907_135049.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/kumasaloxelizafogamowemix.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/rojemobivujivowozavow.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/37344990575.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c11e4e699---38186756425.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/ponaziv.pdfIn PDF document text
    • http://dasbluemchen.com/88466640368.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/bavokufusowix.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a4820b7fb---mokuwozofeximeni.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/25051576676.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210903114445_428743618.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/bimuren.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/bekobopexo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613006a54b96d---21809640337.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_off0000d512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD512 17700 bytes
SHA-256: c8f3d7b0bb586b038a84b36eeec0eb1869acb52fc7994bf1d15f8465a92b29cf
font_01_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACB 10412 bytes
SHA-256: f3364c005b56bc8545c8b5d5eb5c4eb4ad260d67746ceb2cee58a4bb6cec9faf

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