Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12c67e6979e7c68…

MALICIOUS

PDF

98.5 KB Created: 2021-07-19 12:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f315a30fee83d23dced8c88417ebcc7e SHA-1: e70e4ad3bd62cbe2dacc13477254613599584f8f SHA-256: b12c67e6979e7c681ad32cc1aceeb9a303b2a559f83a4fc6ef6712c0072e63de
204 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 a lure to execute commands via the clipboard, suggesting an attempt to download and execute a second-stage payload. The document also contains numerous links to external PDF files hosted on various websites, many of which appear to be compromised or disposable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://sharon-barron.com/userfiles/files/reviwenawezuv.pdf In PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/78795466413.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/4vjv92hv0r651ga4gudpkeafka/pukifibunituruka.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9bdf9e0f7---74633655621.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ecf3418ac12472f94d98a77f1e7455c1/60746593068.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a192cdbc721---44430938653.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/9366574008.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210713_050238_1936.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210521231517.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/kegevetejam.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/dinufap.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/nedavizif.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2091bded0---kemexonewepesiva.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160771daf4af97---fubosil.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/ledabilezerezivapomit.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075eed9b5364---kukepawavukival.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/wopupiluwajilobibirigotob.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/zaxirivadijenaxin.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/80ohl09jtf3guars8g1f1e2bb3/kejunubexudemijo.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/30274052144.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac511baf803---bujutifovo.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f77932d26b021692ddc9902c5eb1e160/31383737711.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993c31849a5---97827909773.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4190cc2363---58585646130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=removing+intermediate+containerPDF 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_off00011dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E0 17648 bytes
SHA-256: 42cd7ba9cda98710c41e1d4a72955f3093851d82a4c39a1e1dd2f49059d2e468
font_02_sfnt_off000164b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164B8 10608 bytes
SHA-256: 496d63cb0992a5a52107b2ddf90484f085f2f4d2771cc751e0d062bd1935afc7

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