Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd8fd2f9f95d417…

MALICIOUS

PDF

85.8 KB Created: 2021-09-21 02:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3442afe17d5695b61f1f2f8115288769 SHA-1: fa5b88bcfe92be3ac3543b6546f5c1df8e028cc7 SHA-256: 4cd8fd2f9f95d417869d9c197457f01b1392fa527746fce24e444bf3c539adab
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URIs pointing to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of these external links indicates an attempt to redirect the user to malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=aesop%27s+fables+with+pictures+pdf PDF link annotation
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dba6275e3---giriraxomorafakisobudapox.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/53479847035.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/bamozi.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/nuvizunetowizosed.pdfIn PDF document text
    • https://istanajp2.com/contents/files/sijuferufoj.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/sobaxaxirikonu.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/21834055699.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/2407080745.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/migusenimibok.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/80843647965.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/betetemuzimelu.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/24041337233.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/nupamejeb.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/gufilezufevidotugata.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/13046917100.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/87448185014.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/77906253112.pdfIn PDF document text
    • http://edallyshop.com/upload/files/nefaf.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/wumoxurafefu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393e9de5d66---tibedabubujukuzes.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/48518908731.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/dezikosam.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613820f0b8892---39150853085.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/pimebazusut.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16136910187afb---vifojinawodofojo.pdfPDF 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_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 18172 bytes
SHA-256: f9428f217bd14b7681021e75165460b9658b23087172a274cf43163ffd4c34a6
font_01_sfnt_off00011770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F87 10956 bytes
SHA-256: f96de3fc5ea2e6daa5325cd2668ccf1672e6f21fa3f8cabfd3a8eaa4c80392e9

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