Malicious PDF — malware analysis report

Static analysis result for SHA-256 a084eb3085206981…

MALICIOUS

PDF

73.1 KB Created: 2021-09-21 22:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5a9a2762b488b2f0592b4da64f9bfd2 SHA-1: 08ff34da32268d56772d6dfcba7342b726fc1fc9 SHA-256: a084eb3085206981f197b532591031b4df14316f474a86350d315aed754c63a5
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these link farms. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://equator-maritime.com/userfiles/file/nejekodag.pdf
    • http://holland-ex.com/images/blog/file/foberogufuwivove.pdf
    • https://inprovitcolombia.com/ckfinder/userfiles/files/92078632775.pdf
    • https://halkum.rs/files/suragexo.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e8fdaf637d82f42bec3b6bb6d8fe76da/mikomutaxa.pdf
    • http://alarm.pl/userfiles/file/kulomus.pdf
    • http://aci-immobilier-douai.fr/userfiles/files/21923733346.pdf
    • http://tarnava.eu/user_images/file/vamatesumikupurumenuku.pdf
    • http://hanifeugur.com/image/files/roxefifirefonizatuz.pdf
    • https://dalilak1.com/userfiles/file/zuverudawosu.pdf
    • http://meble-tk.pl/userfiles/file/23707398875.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141ba293a2f3---9056148939.pdf
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/29767901611.pdf
    • http://kurumakaitori-one.com/js/upload/files/lenevogolifufupetavujum.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8bea2dc6---xelobowujozamabewevinope.pdf
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/befujuxaxemululojaxe.pdf
    • http://belly.bpv.su/content/files/files/80082145469.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/43304807424.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/batawerebowivuwudu.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/71558443e7f00ecd0f44e2d281b2b12d/83412316418.pdf
    • http://vibrator4you.cz/UserFiles/File/9925525921.pdf
    • http://blow-w124.com/js/upload/files/4835088899.pdf
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/28174314860.pdf
    • http://hieuchuan.com/upload/files/xopupufimulapik.pdf
    • http://gzafjc.com/uploadfile/files/59458666948.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+i+can+check+my+phone+is+hacked
    • 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_off0000bf6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6F 16792 bytes
font_01_sfnt_off0000d781.bin
6627b28911bf43a5efc7245b2226311b33f68e0fa27b7237945bad03ed457c17
pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 15304 bytes
font_02_sfnt_off0000fe17.bin
0fd20a9f1709fe4515b3f44c4fd9bdede2c6645a8cdd14e0f3d7c75be4428ead
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 10816 bytes