Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d52ee433d10bc4…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 03:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7128b2ba5c3cdcd5ef4b89013c60c557 SHA-1: 8020fddfd2e22b86f4cd9820ee34c670063f3608 SHA-256: f3d52ee433d10bc4a647b1b21f59cb6ae3b3c5d4582a8ae024fefb8a46509a25
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 0.9990

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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a895f20a0---kuposojuf.pdf In PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/zirizi.pdfIn PDF document text
    • http://ge-mak.com/files/welironijinajega.pdfIn PDF document text
    • https://parc-hotel.info/file/52853505680.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/xujojetokojikukeda.pdfIn PDF document text
    • http://heureka-cz.eu/files/14626989939.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/84374906868.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/512733921.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af362e3baf---rufawukopikup.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/23552761659.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/d393a2c26ce3e7f20b47e8aa9d5223bf/73447653337.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/20902047845.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/029culo4kljgpt3dp428e4kpoe/62336770538.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/84343103222.pdfIn PDF document text
    • http://jrjohnsonfamilyreunion.com/clients/0/09/090f04f22b165063c0e57546eb93b169/File/16788293050.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160addd21df46d---rexukutowizofijud.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog//file/38826641161.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/32322680550.pdfIn PDF document text
    • http://didopack.com/files/57234138625.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/355601a7468f83c6137f95288afa1c53/nibigosujivesixamusofo.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/tifezedevudujegexafu.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/pezopizigokaxugi.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/gojor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=clash+of+clans+mod+applePDF 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_off0000c464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC464 19732 bytes
SHA-256: 0f9a77d80078d6a34e6e50dc42034dc77a7c5aa4abb4e1022c51e771970e2b15
font_01_sfnt_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 10624 bytes
SHA-256: 5adf08e362578fe9cb9abe289da07077079760cfd2347f226976c5b11cfcfb0d
font_02_sfnt_off00010f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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