Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc08d3690195914f…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 19:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1ef0a44f7d76442e6e11a02a21740a1 SHA-1: d49d9e1d3c52052dfb3cf948599e6a6e2f780abd SHA-256: cc08d3690195914f827f4bc18b017719d76f3f2f45bd11d3fc1e4019fab685d8
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF itself is the initial lure, potentially leading to further compromise via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161309cc5cedd2---19335030566.pdf In PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/43341630647.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135579645af5---fonigilariluxadetopagal.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/10678397824.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/fewapowemasevakapor.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/1483272673.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/39234138630.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/reworene.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614642370f320---25680460914.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/xawuwexefofepuvolamadule.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/pejawimiropij.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/50000565006.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/wosozukodunina.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/90651304142.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/f1123bedb52d0051abed1aa3dae0f489/xerugiwox.pdfIn PDF document text
    • http://my-glc.com/uploads/file/bododozetimenodix.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/22713062540.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/69083245328.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210903010705.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b70a5f40bd---duwafixetutupipikenatajex.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/sugemavemiz.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/53417612906.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/nekebizikoduwanatiretulan.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/97659184871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dirty+pool+game+apkPDF 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_off0000b0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F1 10528 bytes
SHA-256: 623647c075ac5d3a5caabf11984309a205b15032a383c20f2e0e35d3a432e159
font_01_sfnt_off0000c8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F4 16156 bytes
SHA-256: b885c311fd86122746267e4f2040ca974e5e333d5f97626fb9e2b32ae8ff41ac
font_02_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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