Malicious PDF — malware analysis report

Static analysis result for SHA-256 98847e958b75da36…

MALICIOUS

PDF

77.9 KB Created: 2021-09-01 06:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 647e8e2bedcb971a7e45a36bd166704c SHA-1: a4ae0a2dabb88cefcf82b8924dea10fc976f0d42 SHA-256: 98847e958b75da366423438b9c7f37265f0c61a2d39d119c246daaa82bf6b6a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sassyissy.com/survey/userfiles/files/sevimawakori.pdf In PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd7b69f78---wodelisudasereludax.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/mifuwadowezivi.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/fukelenuxul.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/96534423733.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/917tnk4r25jgkg37mnu0qfgur5/21811161752.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/22008809831.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/82414207834.pdfIn PDF document text
    • http://silver1979.com/upload/file/59036020941.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086beb533cf2---37520651263.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/52038888412.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eadbf6e77c---575704670.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/96383812158.pdfIn PDF document text
    • http://halaljones.com/uploads/files/81565858271.pdfIn PDF document text
    • https://robertbah.si/files/file/35993830120.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/sutajogepuvuxojerepujaf.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/19480794635.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/samokejirejupomugeberoban.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/gitinurelogepaniperaze.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611853b7c0152---65446543468.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/otjtg83d4eacvvct5qnvt5efjp/katekaxavotawuvobutej.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f514d267c3---kiwinereruzadegupon.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/tegurekoxewoboduwiju.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/jufidifepipewunivowunav.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/22743025698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=2nd+and+3rd+world+countriesPDF 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_off0000ce57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE57 10744 bytes
SHA-256: 6dc5133e68938ada329e38734efcbf04ac3653b42ac0e25b133e967a8cf738d2
font_01_sfnt_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 16352 bytes
SHA-256: 12476166a95b7084d6b29d79b27f84035bccda9e5b19ec5c3d0e6f161e592864
font_02_sfnt_off0001112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1