Malicious PDF — malware analysis report

Static analysis result for SHA-256 5596eca8381dd3e5…

MALICIOUS

PDF

89.4 KB Created: 2021-07-14 08:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ab0a93d6a0eb1d2d5e29706f3750d86 SHA-1: 7ff98d2a4ebb60877863e2a97718a806d6f5f9da SHA-256: 5596eca8381dd3e5b4f9962fcd4044c098dee198878fa91b92d7d9058ecc5811
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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://chcial.ru/uplcv?utm_term=nico+tortorella+in+younger
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/59174019400.pdf
    • https://vildmarksjagt.dk/userfiles/file/penedu.pdf
    • https://mallncart.com/userfiles/files/40984913435.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6fa8930df8---76159745015.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/65764415681.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20cb406bf---32477256283.pdf
    • https://carcable-bg.com/uploads/pictures/files/25282627226.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/sixizavonuvajir.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed95395a053---37619051664.pdf
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/85451795702.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba94a67d49a---91294675345.pdf
    • http://tourister.kr/userfiles/file/45786371380.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608798fc6997f---79491663071.pdf
    • http://ballstonfamilymedicine.com/clients/861402/File/62377253604.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4c35952514f17e8b45cff1a76f2dbd6d/sikaraw.pdf
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/wutepo.pdf
    • https://bandotrading.com/uploads/file/gidukifuna.pdf
    • https://sasalidayanisma.org/uploads/file/jonumad.pdf
    • https://minlinart.com/archive/upload/files/zajuvewaxodajovotag.pdf
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/67209361652.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fb807a684---82354889713.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c48e014ff0---xozemol.pdf
    • https://didacostruzioni.it/userfiles/file/63273051838.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c1900b237---romuf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa1e.bin
7ba54115c9f242ae9731bff754fea41643fd18a7560993229b6f8d1308f1d08a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1E 17176 bytes
font_01_sfnt_off000126fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126FA 16792 bytes
font_02_sfnt_off00013f11.bin
7be9c8af46f5fbf6529a9ec17bfb62a58d10a46bc0ccc45741844444910d3c4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F11 10428 bytes