Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e39991528f9bfff…

MALICIOUS

PDF

91.5 KB Created: 2021-08-09 01:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a829dde3e6fa42ead5547a17a90caea7 SHA-1: b1020b8e15b5f8967d58c7132911f54a140821a3 SHA-256: 5e39991528f9bfffa60fba5ba285d47f459e88284f520a96d4e56ac641d158ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8552

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://crysiq.ru/uplcv?utm_term=how+much+money+does+youtubers+get+per+video PDF link annotation
    • http://myjobcareer.net/userfiles/file/2021052006215473499.pdfIn PDF document text
    • https://tessuno.com/upload/files/60f02585ecfb3.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb9fa29630---ramibilizij.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/vuduno.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd62765796---rivukadesujewexalim.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a5332c6ff---76868776734.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/bigazoragoba.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/84845130771.pdfIn PDF document text
    • http://geasit.it/userfiles/files/92539237663.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/zopopivujemosino.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/68324467986.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/97947615518.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/lazezudibitilozomijasi.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c67dafe8bd4---fodojorigibufolil.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72436191711.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/68474485652.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8957eb4b16a153413b8d43098a99dc28/9846853566.pdfIn PDF document text
    • https://tigapilar.com/upload/files/xuvonol.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd3b5d4b60---12910265582.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ub61gokhnam7dt5me56pe6hu94/55876061154.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/mozuvobawigewuwopob.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/eiab5al1bpoo17t3v62ufoppq4/82832203815.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a00b99247a6f51835baef15638c4e4eb/pebajuzavulaviziv.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/813eced39877c4fbc3701727d483200f/nutivosefoki.pdfIn PDF document text
    • http://matras-devison.com/upload/file/jolilopetosazuzufivapena.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_off00012216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 17920 bytes
SHA-256: 326bd310af96a2b5b9022175b14d934e3545c14d28292d0eeb8096f974be6658
font_01_sfnt_off000150b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B9 11248 bytes
SHA-256: f1dd94831cd036bbab7a2d90f0869d4d6a469701f17a58660d9111fc8f6d4d11