Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d242689501577a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 01:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da62e409af3f9df0f813fc681083b11c SHA-1: bc0ef0df2895e672d3fa05bf1671f5a0e3032ad2 SHA-256: a8d242689501577a12dc85f6a818d2c72106801fae1b63f91cb8a4c36333892d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, redirecting users to potentially malicious or phishing content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/sr04u5053o44ketd4g37a60ng6/76321447049.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/160f9a6cab826faa0b9df2714cb66e50/gujatubazubipi.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9eb368f317c804bb282cddaebf503bd2/velebowinonakifo.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1629362870.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/lirasibodog.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/35713359358.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/56975623242.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/janasuloluvoraxagololan.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/e208f8129335f640be5a4276b18a7c71/tafasijajariwopaxizekew.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/pogasotigudewetaxot.pdfIn PDF document text
    • https://aashianarealty.com/file/38020906894.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///14467403615.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad31860f1c1---82250985681.pdfIn PDF document text
    • https://lemanssrl.it/file/bisuxewinaxowefajopag.pdfIn PDF document text
    • http://vejwun.cz/images/vegabupenigufe.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b74bb4e413c---70569288189.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/vabunekibefivawar.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bb02ca70e---runebitipekokasige.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ecf641216---83263093836.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c7b3891e1641d55cee62007b48f2f34b/wedoxonifipedafowo.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/94174899628.pdfIn PDF document text
    • http://yilip.net/userData/board/file/13406451084.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/13104791630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=contoh+soal+spdf+kimiaPDF 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_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 17656 bytes
SHA-256: 5557e8a8c42569fabd8541a01caa7bdedce55d5b43dd54ae483d315aa714720b
font_01_sfnt_off000108c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 10656 bytes
SHA-256: a05953bab16311b277375256b3352aae7b993ff0c609df201c15621b9406c0d7
font_02_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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