Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7abc024d4972df…

MALICIOUS

PDF

121.8 KB Created: 2021-09-21 01:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 61231d8053e89b89159fc82641747186 SHA-1: 8a78f757f0e3340827dae9d342f0a5e2769a2b1e SHA-256: bb7abc024d4972dfe365ec19af0274cdd96b25a2ae4b80d89b90fea71a11d599
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a link farm pointing to potentially compromised WordPress upload storage. The document also includes a critical heuristic indicating a lure for clipboard command execution, suggesting the user is prompted to copy and paste commands into a shell. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://urbariatprasice.sk/upload/file/tabube.pdf In PDF document text
    • https://cpc-serbia.org/js/files/matujufazakevisesozukosa.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/92521616148.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/ninotugijute.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/juvewebomesitu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/nrmdqi0jc4ukdcvqqj9glu1mhv/68086585084.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/damibezixubisemelepudubo.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/17081837974.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/zufuzibuvulolobi.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/74453372122.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210909125455_bwgek2.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202193949338154.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/xutuw.pdfIn PDF document text
    • http://talesma.com/E/file/98066250499.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/20818769789.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/41069263274.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/48228028426.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5u9olciri7rg5l3jgl55mu27f1/15930912226.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/u9krf7j8g66e2o5uq26r9flh2s/dafexobebolos.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/xowavupenatutewiraxaju.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109050903319995.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/masamebijaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+recovery+3e+signature+verification+disabledPDF 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_off000172c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172C6 19672 bytes
SHA-256: d561fbb8e79f506864ac72c70b69fa263ee36c431bf89a4c7d672cbc00cb2693
font_01_sfnt_off0001a705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF1C 11224 bytes
SHA-256: 9f8cafa393299197b69a0f546f12d27c307ad1c30377c3ea5483cee4908f8e81

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