Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fed31a8d62b7620…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 16:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c5a33e02c51b91564790fe33697c4ba5 SHA-1: eeccc5cf93d0344612eff5bc634ff81fcfc7cec9 SHA-256: 9fed31a8d62b762001597c2aa692c8369cae328d38789af2ba3c074de4899e70
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and multiple external links, many pointing to compromised WordPress sites. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs the user to copy and paste content into a shell, likely to download and execute a secondary payload. The ML classifier strongly flags this PDF as malicious, and ClamAV also detects it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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
  • 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://irlanc.ru/uplcv?utm_term=access+smartphone+with+broken+screen PDF link annotation
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ecf3d7f77---61078863349.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/56483165117.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/rakan.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/16371943191.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mirorogakexotigu.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/lomajaveronivuvam.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/bqrt10hham84uuhve7j9r0e59c/96396270240.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/84179530225.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/93640525252.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/39377426571.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/35795173046.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/16688913890.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/jajosusaseleborepav.pdfIn PDF document text
    • http://zimmerei-possert.at/kidejekupojuferafiwotib.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/57331544862.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/61061565180.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/10535453003.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161340335dd443---95858944444.pdfIn PDF document text
    • http://topstec.com/d/files/73446788256.pdfIn PDF document text
    • http://keramann.ru/uploads/files/fuboguxaxo.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/48638966990.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/78334693482.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/95040554374.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/27031236117.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/webunimexevevutuvonov.pdfIn PDF document text
    • 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_off0000dfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 10892 bytes
SHA-256: c07dbc393241e21493198ccfb03ba35d61473e1f4dcd02d18ff63993fe9706b5
font_02_sfnt_off000110b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B0 17408 bytes
SHA-256: 39380d8b080aba4da0d081ff08f5cd1668b5b02b604b63e3b97cfa6cc29e0748