Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f8b419a2f8fd5e…

MALICIOUS

PDF

86.6 KB Created: 2021-07-01 09:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a876e8d09b4ab4e6a3cae93f012f064 SHA-1: 04c3409b5078aebc70df343045898f682640271d SHA-256: b4f8b419a2f8fd5eb664339a8f90303254eada557727d92cae7d13de90274570
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://besttailor.info/ckfinder/userfiles/files/sotojofidujesodegipuni.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb49a3f983---gilitikijuforiwu.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2883a5b7cabfd301bfc86a90f07fd398/xexevufitibukubuguk.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099cf767334f---giwunome.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/pgmq9d3hp8855am3vj4cagutn3/77289647294.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3667563e84---jediwake.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/bgpou36codm23cvqnhftufj3r7/98353492308.pdf
    • http://fygl.net/uploads/file/241659557173.pdf
    • http://longthinhphat.net/uploads/files/14938489547.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aae8aaf4e---21259695961.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/4n2prcd0ro2lnak9rufj9p1du3/wolefagogibukozoxewiw.pdf
    • http://imi.vc/upload/files/kevasefotoje.pdf
    • http://stressmanagement-karriere.de/userfiles/file/8591645499.pdf
    • http://asesorgubernamental.com/images/file/penadibu.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/5fb01572481571a2815d042349fceb90/24702077900.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f9f14fb10446105587238d5d320fdf5b/bujugosodogebasetegogik.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3e538b709---89393455850.pdf
    • https://silverwayshipping.com/userfiles/file/45585673139.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b580a1906086798ae1e7ac96c7e3a1b1/lepuripaboxe.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bd84a58b4---novaguk.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/65844287283.pdf
    • http://www.findvoters.com/userfiles/file/vuponumatenejazulagoposun.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f2afd35bed91ccf416eb52d7a67fa4bc/xemapadeg.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=can+muscle+turn+to+fat
    • 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_off0000efd5.bin
16ab33d3ece83b8d68875678e978f14459eaa0fe14fa26d339474d36a25309b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 16932 bytes
font_01_sfnt_off00011bde.bin
5ef5550ada319a699eb3bb02b7e5a7cf1d4fad1dfec75f03ee5b32fb5f2a5389
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 10536 bytes
font_02_sfnt_off000133e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133E8 16792 bytes