Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05962fd0b9ba4e6…

MALICIOUS

PDF

72.1 KB Created: 2021-09-01 12:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6dbfd6762db4c12acc83e095ff5b334e SHA-1: 7da0f9346dca6f769ad0591c1fedbcf495270bd7 SHA-256: c05962fd0b9ba4e61cd2e443c5881edc9927376b6e329890bf96a50dafda953b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple compromised WordPress upload directories further suggests malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://piataafacerilor.ro/app/webroot/files/userfiles/files/33712316043.pdf In PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6f8fbcc8b---ramunaxuwufaxida.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae783649ecf---56384435871.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608037c7eea87---72686158711.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/48709268345.pdfIn PDF document text
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/guwegevanexirisiroxijik.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/595a576d112d04fb3cd6d32c7e385a66/tawiwupefaxedobixibegut.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/0b526135424939aea456fc8f2b70e0d0/69148061250.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160be2b493c923---20261207224.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/61a7df2d4c0addbf3cfb13356b2fd08e/28136772338.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/98511263966.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b2b99a5da---tokezofidujipewusavop.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/ba5c299ee8d40e491a20021e5482b498/61300003459.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/ralepitozasusi.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/83519915865.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/vuzofadim.pdfIn PDF document text
    • http://446888.top/userfiles/file/puwijibewogeb.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b81618f952---kemuzinuduxilazofejuzatu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3943875d602d4679c9139e5eaa24f39b/vazovuledekuvox.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/53748916854.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/d185f36ce14e37640c86189a49a4d618/sikavomazuziwapozokefeg.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/55389068512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=effect+of+enzyme+concentration+on+reaction+ratePDF 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_off0000bd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0D 10440 bytes
SHA-256: 8564f48d102f34ad95e06929d8fdacb5c24a568dbd028ddaca6ffb2d0fb3ffb0
font_01_sfnt_off0000d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 14672 bytes
SHA-256: 8bccc584b305c2b5e2b8fb1eb9e644ad5c07084617a2e4f85612bc1a46b2233d

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