Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf335e8a25a1fc0…

MALICIOUS

PDF

91.4 KB Created: 2021-07-30 06:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd8c23a0c62cad4e4e30dcb2050e5937 SHA-1: 7c50bfb3aa9ac933494110d5ca5b1101e6ba3d0a SHA-256: 5cf335e8a25a1fc0f350e69909452baf78dcfa1b89ac0cd581b7d3b9fec2738a
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or are disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of link farms and the overall heuristic profile suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://kfnmdg.com/upfolder/e/files/20210619065822.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798de3c8915---79764526231.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/moxevititanavixobesova.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0041e5c1b6---zomewasobapudep.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/tuzibevupobo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a8b6fc51fa65a9f0dcb21638dc06e4b8/tomupuxuxovuzoloxatom.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/5a4frallib94csnogsv8e5h0n6/pusekafi.pdfIn PDF document text
    • https://j26clean.com/upload/files/91461392917.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/20565429452.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc28466e68---56373476527.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f98230d4af---66865595512.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/133c8b1bc4f563ee429e652e6597caf5/dokemedeguputi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aef357a716b---xudamirojevitu.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/42906071451.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/sorubugisiditadotunobusod.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/vubodilejebudibipa.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28e0810fd---jesalepenuj.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/29221833519.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/d7iipguat68gqdj467p6is01o6/99039119207.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/53478792523.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/supemowe.pdfIn PDF document text
    • https://areicon.com/images/file/53517392711.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a41d07a39ab9ee899fde549e9bec1e52/vetorawemisiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=adding+and+subtracting+fractions+worksheets+pdf+math+drillsPDF 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_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 16828 bytes
SHA-256: f0ae1d3b6ce55dc0ff7caf914c9662627d9d595f2d9cee00708eba090e62aec2
font_01_sfnt_off00012bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F5 11464 bytes
SHA-256: 589b36031d0fad897a8e2113f8ad91c27a023a7325f4e18de7b7a943801851b0

Open this report in the interactive analyzer, or submit your own file for analysis.