Malicious PDF — malware analysis report

Static analysis result for SHA-256 5166c8295d7198fe…

MALICIOUS

PDF

76.1 KB Created: 2021-08-26 01:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 121ea55389ce321f14ce93c176fb067e SHA-1: cf7ff06dc9dc811d206b52f28a73b46399ea9222 SHA-256: 5166c8295d7198fe9f2a22e0f7c4ca9b2d3cc820e4db81d16ffe33c69aea968e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://queure.ru/uplcv?utm_term=scarlet+heart+ryeo+2+ep+1+eng+sub
    • http://happypalettebnb.com/CKEdit/upload/files/35137502201.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5a1c8d3554bb63f312f5cfd923ed322e/loxewijupebusipugisona.pdf
    • http://cuacongtrinh.vn/upload/files/88107454976.pdf
    • https://wupaojichangjia.com/d/files/4208764736.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0a7becc7f2613b5a17870f3f379ac14c/mopizesubime.pdf
    • https://budapestpainter.hu/ckfinder/userfiles/files/11701107805.pdf
    • http://jrpst.pl/userfiles/file/xitimixexa.pdf
    • https://oazapiekna.com/zdjecia/fck/file/9163341139.pdf
    • https://actorconseil.com/files/file/jelinodek.pdf
    • https://farmaciasacoor.com/site/upload/file/76911523564.pdf
    • https://digireg.pl/upload/90852587723.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/p4ukg99d41g59er0mauo28u82u/53982792604.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/9ufduta3du8l8cf93fpe93sq0c/8775999652.pdf
    • http://meetburgerusa.com/uploads/files/89453908329.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/49154060875.pdf
    • http://metabolit-plus.ru/files/file/65747566466.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/popuzulozotadufugagoj.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c863ee9556---sedoxezig.pdf
    • http://indianspringhomes.net/userfiles/files/nobided.pdf
    • http://conservativista.com/js/ckfinder/userfiles/files/lixezelilurimokivewujuwa.pdf
    • https://xo-sound.ru/userfiles/file/nawepufilidaxupefozabe.pdf
    • https://xlspandoek.nl/userfiles/file/gadiratedodetiwomejenob.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d229d26a2d61c58db6d01690da10256f/91762200298.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8a4.bin
e9028ea3c136b0ecb8b5e11d3d1cfbdcb1623a84e85bb09c57e9a3b163d20267
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A4 16320 bytes
font_01_sfnt_off0000e272.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 16792 bytes
font_02_sfnt_off0000fa7f.bin
f8baee5b470e29b3d8033753825dbc69eff683edfc858002b89eb075797a1058
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 3652 bytes
font_03_sfnt_off000108bc.bin
1c56132e21b1e16011fbe0a0161ff81bc0d4c17788bd2ac69ad98c8a0c60efbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 11164 bytes