Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6abcead42a8d34…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 17:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11e52a755f559f45d6516232dc48b6c3 SHA-1: 2dd0d8d0aec881d3ffde42e05cda8bdc9ac57fa6 SHA-256: 6c6abcead42a8d3479ffdd66e107d7f7107ea0eac14af998e9c9d801c982379b
152 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to deliver a malicious payload. The presence of a 'download button' lure and instructions for a password-protected archive further indicate a phishing or social engineering attack designed to trick the user into downloading and opening a malicious file. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=unpack+img+file+android PDF link annotation
    • https://muahohangnhat.com/app/webroot/uploads/files/nowowejilijaxufe.pdfIn PDF document text
    • http://signauction.net/userfiles/file/jenimonewagovupi.pdfIn PDF document text
    • http://cssh.es/img/file/86745571547.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/8171949643.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/16b324221b23dfb892e55eb8a2c2e6fe/14175601061.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/zuvatapadok.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ec92f0f6e923099a44948a80a4048a25/76513439858.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/folaxigigebotedofe.pdfIn PDF document text
    • http://abwessex.com/uploads/files/zifusu.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/simif.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/22433067547.pdfIn PDF document text
    • https://servicepapik.ro/files/mifodowikupatudimudigofu.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/kifenimofojun.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/kezomirafumafozo.pdfIn PDF document text
    • http://agilesolutions.in/uploads/98072903611.pdfIn PDF document text
    • http://atek-ent.com/upload/file/viwutagepewej.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/rexuxowamibowekogoxerogi.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/50395580200.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/61629852557.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/ginosutovilotife.pdfIn PDF document text
    • http://tencanpowder.com/d/files/30155881986.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2ff2f616---merogumomezazo.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161386a87ede3e---nutojew.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/wixofulafozoraxonokew.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/femobol.pdfIn PDF document text
    • 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_off0000d5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E4 19716 bytes
SHA-256: 5d3b66a5241201fbda3e7bd7909a310520e95ede8a9e445aa01ce80ec2ec9d5f
font_01_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 10796 bytes
SHA-256: 4bef623f8eb9380d561c81bf3f57687322a923d78e44ef7a006d9f5c1226e962

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