Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e57a466916009d…

MALICIOUS

PDF

73.6 KB Created: 2021-09-06 10:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8672285c55a2e1f57228a4e6572c5292 SHA-1: 0959f542442cb7c160d07e70984ba61e3d30bae0 SHA-256: 85e57a466916009d06a68cf4badead0f3f5f497c3b8a46fd3e217e14daf3885b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous URLs that form a link farm, likely intended to redirect users to malicious content or phishing sites. The presence of JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7461

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.
  • 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
  • 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://smidgel.ru/uplcv?utm_term=comptia+security%2B+book+5th+edition+pdf PDF link annotation
    • http://abwlanham.com/uploads/files/94548719984.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9de6b123b---7857176694.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2aeb87ad2d---60899551537.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/9111802091.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/cfm9u5gcq2r3t31efabjl12ei1/jenidatevubugeve.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc905a0750---vidikidiladalivuloga.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/nidotiritomaneloz.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/76164455320.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/pawawi.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/jidadu.pdfIn PDF document text
    • http://camwater.org/media/files/50707899777.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/46574561169.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/0fv1jirosq1clo3sdh51td1tnk/tesasozut.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/82370358203.pdfIn PDF document text
    • http://ruihuitax.com/files/file/firafikawarijekezafinereb.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/48470804436.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/25844909190.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ra9jr8e8doos6s0pk4t3jt8qsj/dogusosikadokunodobuna.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/a62f7588ebbc0921edfe702251474696/loparetadavavewudizazepu.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/sadarikisalog.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/23761989748.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/38383571241.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/677df0d6b99666bd92faf2abea9c8a67/tubupifokosetuko.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/o8lhb0u2v376rtcf77qtoe6mgv/ruluwatujajaguro.pdfIn PDF document text
    • http://vhshf.de/File/93968572439.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e6f7f33b2d8415a80fd03b01e9097ae5/41073171803.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 11452 bytes
SHA-256: 03efe63cd592cfe63bec615e2ac1d7ee63843ee28d8fca8db6794be64c0ca418
font_01_sfnt_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 18212 bytes
SHA-256: fcc1b219f43d739b235c59c744f7eb0ecce039c0b37e08dd680939472194fbba