Malicious PDF — malware analysis report

Static analysis result for SHA-256 c849ccc81ac94800…

MALICIOUS

PDF

85.9 KB Created: 2021-09-08 02:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a932d03192ea460c8f640e607eafddd0 SHA-1: 64f450c4e5df80ca8c95a4ed8ca268ab88e9c421 SHA-256: c849ccc81ac94800b52dc74ef20375d97a7a7bda2ff0fafbff550f5a2b65ba9d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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://galantemontagnana.it/ckfinder/userfiles/files/23717285566.pdf In PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dd4c39bbc---vetosepewofinosurabuxexip.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/9302e9375ac2e4b3a98e3ed0d01b1fc6/daratinexegisana.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/42707365661.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/44177479502.pdfIn PDF document text
    • http://fnathservices.com/upload/file/65408387021.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/55100406774.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/28348365790.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/97041050321.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/89868153375.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/n53flbmmu0sfg3vn427q954561/wupadatafegewifezomexemej.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d29897270---gerumidixagavekizoka.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5bb2bbe153acbea7881e88f439335d22/66386340156.pdfIn PDF document text
    • http://hasyo.net/files/file/butisulipuwaw.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ffeacf37235---tedinofobaravuzi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161293f216f39f---nolel.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/0c75ce19811ae0e039649088af6f7036/jezimabadawefi.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/61859159102.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/57468129870.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/95047605775.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/81303131686.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776b8a9ef6c---79595157228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=operaciones+combinadas+con+numeros+naturales+ejercicios+pdfPDF 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_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 20708 bytes
SHA-256: 36fa23a97468a8cb46c845abe0ee91523e3f32f18772efc27f504fb78852a3c5
font_02_sfnt_off00012f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F79 11176 bytes
SHA-256: 951675bafce41e7af871c8b2cec33185a590ce5ca55e73b3349720fae00f368e