Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeca77f17f985012…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 19:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1082d1a1c59621e50d2d3a99de9e7a51 SHA-1: c409855887738e07f25fa269a2295d7c1ec57bb8 SHA-256: eeca77f17f985012c21ae5cf681a1434840acddf7a7efaf78062436b76bb6c85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and links to multiple external URLs, several of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/bbac01d68b58e061fd4f1268f6327fb9/16402133318.pdf In PDF document text
    • http://lehnerkom.de/images/uploaded/file/97065659898.pdfIn PDF document text
    • http://wsm.hk/images/files/65280286870.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/gibujinesafupologofifavov.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/fasomipebokelikolewadik.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/sudorekutupigebinizu.pdfIn PDF document text
    • https://olterus.info/contents/files/75681789269.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/56734796705.pdfIn PDF document text
    • http://splogservice.ru/content/files/91776794982.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/satedemezi.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6a54cacf---27428534982.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbad53d17---girilomawatozijujino.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/savezizove.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d86cefa811095d425471d7d1ade65d3b/200785859.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/41461746200.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/87586153635.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/1197979657.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109021522444477.pdfIn PDF document text
    • http://hmed.vn/upload/files/danivefiw.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/45224219435.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/fojewusokovitakotopip.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/65904791966.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/tujudujofunuxeras.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+airplay+mirroringPDF 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_off0000dbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD9 10432 bytes
SHA-256: 6ab2c7c092297982218c38a612f1a34ecab6c85abd3812c804fc0efaedcca6e7
font_01_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 18056 bytes
SHA-256: 778e6b2ff0345ff06bc3836c2b16d48ebea398a7ce77643dc3a216c0f6c76ae1
font_02_sfnt_off00012146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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