Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ba15af7e976be0…

MALICIOUS

PDF

86.6 KB Created: 2021-07-22 16:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc40b210c2674732e245725ef7daada6 SHA-1: 4c12abe8bb91bd699b0633e6fc2a215e90a7f5e0 SHA-256: e8ba15af7e976be070e36f76995b2bd16c1262d10332810ccd742f3b4a39e3c7
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and remote support lure. The document's structure suggests it is part of a link farm hosted on compromised CMS platforms, directing users to potentially malicious PDF files. The primary goal appears to be tricking the user into installing or connecting with a remote support tool, which is a high-risk activity in an unsolicited context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f90c35550---26332662231.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/17888100961.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/37194449079.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c5e42adfd---7663561039.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/djtcrqik289q7kg41911i3eapk/99895957618.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbc645007b---68445513826.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/an8rgmqf8ecie7lbvr82caa8mv/35230662151.pdf
    • http://ajtoablakcentrum.com/_user/file/37375211414.pdf
    • https://amsteroverseas.com/ckfinder/userfiles/files/79299741380.pdf
    • http://emrc.ie/upload/imagecontent/file/52831523908.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a98429c7---64133231176.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/51f572a49d1a7be6f4289d88c622ca65/gokuw.pdf
    • http://botosani.ro/img/uploads/file/gagowurujijama.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/11559776785.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d4aa47681---tases.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095904895ac9---vinubakufujeforajorevu.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c931a29076efedc4d6715cdc5a2310a6/xozufakusasisinolagovonir.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/rfog4pbup4it4jike3h6gs6qe1/76448216612.pdf
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/kedaliwikabobus.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5bbdf053d4e4073eaeda71f2703df76/wufolonezafiwipapudin.pdf
    • https://nestaerospace.com/uploads/file/zufubudamapujaj.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/35043c08a9f17e606478b4757c2172db/kokubitexifuxomerezul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=something+in+the+way+she+moves+me
    • 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_off0000efc9.bin
5f445be34f9fe9400feeba2c0a35db360e8d76ff1ac546083bb139b50fe03083
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 16928 bytes
font_01_sfnt_off00011c06.bin
d898989021290c3d7108b964d93f10538c4fbac58be1a1596026b232ef704605
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C06 10752 bytes
font_02_sfnt_off000134ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134AB 16792 bytes