Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9a9ddd067c0266…

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 00:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a044e8c240e2004c2772bea3ad6c9f80 SHA-1: 2c4e4617f5c09c74e3a974d2c39a590ec594b4be SHA-256: cd9a9ddd067c02664cda02ba5207109599f1dc35e4f62c601812ea92ef3d1db4
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is a PDF that employs social engineering tactics, specifically a 'ClickFix' lure, to trick the user into executing a command. The heuristics indicate the document instructs the user to copy and paste content into a terminal, which is a common method for downloading and executing secondary payloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609670c374477---wubakamunonuwawemafi.pdf In PDF document text
    • https://yennenga.org/business_school/uploads/file/69850832309.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16123986ee9fe9---jasega.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/94743577978.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/jerurarodabip.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c2860dab89d44fea5b2968590f0b3e86/saxorimowazozowa.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/midexe.pdfIn PDF document text
    • http://guowangcable.com/d/files/ripomafugupenif.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/duzuxotalijid.pdfIn PDF document text
    • https://hagepoorter.be/files/files/molojaguxapiwot.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/96674212292.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/zibozuvitureminetit.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/632f2d8a466c6c45b1f65302ab583a97/wimadilavatemovovaka.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/tadovokerekuluve.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e5152a55---somotax.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/49627923444.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/a152f90be1da5d4a48890899e79979b7/9979263557.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/26168467508.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/his270s9pretjgstl2vl497eiv/1694153105.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/45820535824.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/88aebb24dae34fdb5dfe55300de2c88f/32171055647.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/xazevupexakegiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+create+a+pdf+from+multiple+pdf+filesPDF 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_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 10856 bytes
SHA-256: 94b90fed432ebf10daacf8256daa32851391cfc3ac6586c2d05a00e215783994
font_02_sfnt_off00011482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11482 20468 bytes
SHA-256: 807ef8385d1527b1ad837a9645147cc173cc595967b6d8f2ee53fa345e1cca53

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