Malicious PDF — malware analysis report

Static analysis result for SHA-256 6950c28b1ce1b1d0…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 15:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc0ace2f91cd8870492984533414d1e0 SHA-1: fbcb56400c545786a6b6b3c445233045143bed2c SHA-256: 6950c28b1ce1b1d0148c273a4d600206ba1b57144d943c159c3bd90b166e8782
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded JavaScript and the link farm structure suggest an attempt to deliver a malicious payload or redirect users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/komukorulinedupugutilisa.pdf In PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/256185892.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/kafutetigidezawovo.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/25417644377.pdfIn PDF document text
    • https://tch.lu/files/files/nusofekusowixovesoxisog.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135361a324ef---mobagupoxekonofinefoviza.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f66c263d1---jeniverebefumudisabuwirax.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/fikuzurisixuxeno.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5c6e716fb79ab4f618522acf05d5a3e4/7030037142.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31550193701.pdfIn PDF document text
    • https://network-italia.it/file/77806677105.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/xawesenebu.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///totino.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/votesizujoxuwadefojaro.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/92736819003.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/42998512475.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/45495046337.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/54609791780.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/18908741805.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307aa374076---15854053133.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/88694520450.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/16169418284.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/fuxerelenovogi.pdfIn PDF document text
    • http://archbot.pl/files/file/60745919856.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/64443440935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=whatscan+pro+apk+2020+downloadPDF 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_off0000dda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA1 10800 bytes
SHA-256: b291ed32978bac573f8abc7f6897452cfbe89beaf320f27b6b1c5f7dae721651
font_01_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAA 17704 bytes
SHA-256: 4a5320919a9aeeba3020d0c6633d16b179ae981dfc1bec606c3e4489a8b7fdea