Malicious PDF — malware analysis report

Static analysis result for SHA-256 7313dedb5c0fcb32…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 10:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b5b78d219ff1dd7186fe51eb3aae497c SHA-1: cb52bef8a0e17fe746a52aeda6ebc638fe3405e9 SHA-256: 7313dedb5c0fcb328d1c347ad13726271ae3da9dd0e25f50ee044f6be41a2cfe
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a lure to install a browser extension or plugin, a common social-engineering tactic. Additionally, it includes a lure to copy/paste content into a command-line interface, suggesting an attempt to execute further malicious code. The embedded URLs point to various compromised or disposable hosting sites, likely serving as download locations for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/2phfk3mgfjf4cdsu0s21nnrn8d/dusotakibomagamawodige.pdf In PDF document text
    • http://atol-res.pl/uploads/file/61887497946.pdfIn PDF document text
    • https://baongochoa.com/upload/file/30256973090.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee513e2a2e1---39750126514.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/8fr8o56k9bdqbgojesq9p750t0/bixaxevape.pdfIn PDF document text
    • http://glassco.ca/clients/9/99/99aa1728c1dafa3cf8773a75727b87c9/File/tiboveworabijaba.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/65915444737.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4bd0e4bf831912a2084dc800984c9d77/wikatexitubilugajagupu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b9140482---gururoxetevegumoranezi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afd69473de6---22409705381.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/lokazow.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/82093765790.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ai6m99mmcnk8bks1oaon46lbq9/dedeserigalepupub.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/sizepupaf.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/k6eo40tsg1a6n4kb0sr3r0sri3/gutevasorupifugabe.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/dijego.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/97440362228.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/51798312141.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e317a39d0---63127700886.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e1c4ea0e2bce9ee0344efb92a1554c75/94667823834.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/qlmda1ro9mm1b36v4udi2as6gr/22320909065.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/faverufonukijemoj.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/13489551519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=add+multi+page+pdf+to+powerpointPDF 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_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 10840 bytes
SHA-256: 43346f2531b0c09364d9334ddfd1cf637d71f21c31100600f3b20f04a850e386
font_01_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 17748 bytes
SHA-256: a9efd4c1889e54e139a695e83803efc90dbfc796c57247e57c158b8b3295808c