Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca10173824108f5…

MALICIOUS

PDF

82.8 KB Created: 2021-08-23 15:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: b2e944bdb43e5226dbead64a22e8ea1f SHA-1: 0febe773a6ee9360ddaae7becf9934c3766141db SHA-256: 6ca10173824108f5a8a6708bb54afc23925b37d320f862e298e6099f78bb7688
176 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.003 Windows Command Shell

The PDF document contains heuristics indicating it is a link farm and uses social engineering lures, specifically instructing the user to execute commands via Win+R or a terminal. This 'ClickFix' technique is designed to bypass macro restrictions by tricking the user into running malicious commands directly, likely to download and execute a second-stage payload from one of the provided URLs. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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 http://didopack.com/files/rijubufej.pdf In PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab403a03694---kejafetigokafavibiliro.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/qgh6kt84j9massgm9nmdubhunk/verevupeverajagodunaf.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/judolapizesuberowepam.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086ddb645cdf---woropige.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/sakadela.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zenozibutopuwi.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/d7a790c293c7a51e2fff6f0ecd20989e/2313374329.pdfIn PDF document text
    • http://dejede.com/userfiles/file/75051846859.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d5e8c51831a4727888960497b0842a29/27392444530.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7oq16aldi472pvco0sb2etluf0/92485006999.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b39d1f244a---61305278083.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b916d669a3---nusunifokewaf.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/wejalofeveruvopidesatesil.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c78afdb3e1f---jadebawove.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/28605489182.pdfIn PDF document text
    • http://nensi.si/upload/file/14387264588.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160fedacd2d2d8---35213016832.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/47059440518.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/12721768789.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/zovijedexipidirevunizagu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/681da84722259a6c2276593d7553f2f3/77327079332.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/33618949436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=convert+mbr+disk+to+gpt+without+data+lossPDF 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_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 16948 bytes
SHA-256: d789de4d37f5ac75ffce8e29a2d32182e95c179a304dcaf6b79de51023e0f401
font_02_sfnt_off000121e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E1 11356 bytes
SHA-256: b247efa0d8f9861775d5a523a652e559f125ad151158f7988515a4348b311d4a

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