Malicious PDF — malware analysis report

Static analysis result for SHA-256 d752cf9a665b4739…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 19:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 70ef76ee8cceab861d7350c3e94b9240 SHA-1: c6fecce3a5ffee42bdf185cc73a5e89117f5c203 SHA-256: d752cf9a665b4739f4b0f302019e00c03a98d78a632cbcd292eed93604ea2c79
244 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and multiple external URIs, some of which point to compromised WordPress sites hosting further PDF files. The document also employs social engineering tactics, specifically a 'ClickFix' lure, instructing the user to copy and paste commands into a shell, which is a common method for downloading and executing secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/p8gipgkanfahrp490ujcdpt46v/74654441015.pdf In PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/47945465893.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d4d531ebf35a651fa3b449fb57d3b1fe/17543000964.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/70391008286.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6140034679---jepetobamedewizuj.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c80d5ee57f---zukatutaweliva.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/42867821548.pdfIn PDF document text
    • https://vestol.bg/files/file/9951806603.pdfIn PDF document text
    • http://sb-78.ru/files/file/28721129829.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7c2ce512177ccddecee281e60ef77990/85858272081.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b9cee008---kokabuk.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210818_073820.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/7459098596.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/badabutif.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/65127424072.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/wesakikozivutubapokofu.pdfIn PDF document text
    • https://plasy.com/uploads/file/62587075713.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/kefajuxafadale.pdfIn PDF document text
    • https://emmaushuis.org/pages/zukemanojibujusugot.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/gefigawoju.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7e558fc74---39499591583.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/99418687761.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/pemosaxinawilules.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/66644541288.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/45831764295.pdfIn PDF document text
    • https://cafesca.net/ckfinder/userfiles/files/xusevovunijiborepusu.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/xitebiwulavekotofibedoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+do+i+restore+whatsapp+backup+from+google+drive+manuallyPDF 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_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 11656 bytes
SHA-256: bc642684f4cef363ad8c731853100cf12cf13fc3975cc534183b218c52cb1b46
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 18476 bytes
SHA-256: ac003ae5743f9d5a1b81d502d26a983c95f96b3ad62321aa56e3665550b5805a

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