Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c0231eaf74e9ff…

MALICIOUS

PDF

96.0 KB Created: 2021-07-10 03:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f4da4c1434e104ac40e84a0f7314634 SHA-1: a363eaf892531e842d1ad561c196650fe16f5b21 SHA-256: a5c0231eaf74e9ffca21e81ef303d7915bce01c8f9dca93199c4531d6e9d375e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting domains, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal being to lure users to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://uleiuri.ro/userfiles/file/dawakorumusositaf.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609227fe6e006---60946418620.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/297e3801a7d93897a7178c8be659ddcc/13513200192.pdf
    • http://www.examnotice.in/uploads/files/79842604939.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8129843bc580f930514f72f2d033b8ea/62125514162.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7e4acbd4f51e16c7d29dcbba250623ab/33713402854.pdf
    • https://torbay.ru/images/uploads/file/820566239.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/4q1vdtj8dokk93dsdgn0t6q7dc/pijakegafejirezavejon.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8813fd681cbb9d8ae69fa50f104e85ce/ladezalife.pdf
    • http://ohappy.org/userData/board/file/21066031295.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d1a4404ba---dakewabefuvogadakudupaju.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160829b4745089---doraxokalepobareruf.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/2151259508.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984b6c248e7---60661193958.pdf
    • http://zrdb-drogbud.pl/Upload/file/77609586975.pdf
    • http://petukmahaaaraj.com/userfiles/file/43820720458.pdf
    • http://arunimaflavours.com/userfiles/file/26276645775.pdf
    • https://noblacklist.pro/web/img/podborky/files/devokopub.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075139041c3a---93782318835.pdf
    • http://websurin.net/UserFiles/File/60575223184.pdf
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51298829677.pdf
    • http://amadpich.com/userfiles/file/fijezakiwa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=living+non+living+things+difference
    • 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_off000115db.bin
a74956abf937f40ac1cebcafa14603731f2c7d4e31f6db9fbc3f51fce26ec0c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x115DB 10616 bytes
font_01_sfnt_off00012dd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD5 16792 bytes
font_02_sfnt_off000145e7.bin
32d751af27b53ea0ef3022387b7e946975ff77d824c7ade1436f2d38067a9d70
pdf-font-stream PDF embedded font (sfnt) at offset 0x145E7 16644 bytes