Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c0c3f32f88c10b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 09:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e2bd67c6379a221430ee22c4ba7fd526 SHA-1: a87fde2c4c370ca572a6ecabddb4b14750e8f58f SHA-256: 67c0c3f32f88c10b2a8143ef1151bb02ea69a79add0b6cd7170e87af97d4a417
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and multiple links to external PDF files, many hosted on potentially compromised or disposable domains. The critical heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a command-line context, suggesting an attempt to execute a second-stage payload. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://investin-khj.ir/ckfinder/userfiles/files/fiwuparajudidaxu.pdf In PDF document text
    • https://gfwofficial.com/ck_imgs/files/mokunaxadijasoretoxetem.pdfIn PDF document text
    • http://husplaza.hu/editor_up/fofovavatudope.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/kezobafaxep.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/51115169218.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/cfd9ff6d6b8d393010a06af26eed20c0/refofifibovosazofodekigu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/likifutirolozagefu.pdfIn PDF document text
    • http://beta-rc.com/upload/files/genutafopowotobojigapuwed.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/80101870300.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109070459533594.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322163ced2c---doresexonutovomebi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d2d5f3259---dasaliminim.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613748dd76859---tisaguzofujas.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210901060528800.pdfIn PDF document text
    • http://spbi.cz/res/file/37249710930.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86735101485.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/mapatimifogukesekabiwexa.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/57394670896.pdfIn PDF document text
    • http://drtamerturan.com/file/30250006225.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/ribiribi.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/2318186869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=lightroom+6+serialPDF 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_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 21172 bytes
SHA-256: d202983c977d1a9a5bfc61f753c5f4b139f7e9f4e5775520769a7a8b69b9c8e8
font_01_sfnt_off00010fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 10576 bytes
SHA-256: 88e9e9d6b571527a60ac31a59b8d4739f8798d383896c93abc26a9ac59a160c8
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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