Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8781282ff5e7f2c…

MALICIOUS

PDF

84.9 KB Created: 2021-07-18 19:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 08f8b570318ea10be3814e003064e130 SHA-1: ba4733208d808fedaa3f0381a7e9847d8c948cfe SHA-256: a8781282ff5e7f2c8478d48a8cf621d814ef7e6374d8f42628f587434e19e674
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress upload directories. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly indicates a business email compromise tactic, where users are tricked into believing payment instructions have changed. The embedded JavaScript likely facilitates the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://riverside-plaza.com/upload/userfile/files/24389019672.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b6e6ebeff---79326388221.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607451ab88ae8---nokijusaruzonevivoxotaw.pdfIn PDF document text
    • http://odumakus.com/uploads/files/ziwufekefa.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/73950048746.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/nrle79fg498u1gv1p317lkko90/pamadara.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/zudafasadodezapibumaluru.pdfIn PDF document text
    • https://silga.ca/userfiles/file/93156574817.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/37987481792.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813db6e2383---busumifewona.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7b14395b273b5d489bad224f9bab7d00/71502473889.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16217920290061.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/lopakojowiw.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cbf6734b1---95960066235.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/um1ovbhmt691hcoi5jhsan5umg/26365953133.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f544bc1d4d3ad7226b27779bdc659b0d/mabegaxizonizolipazineg.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/19150032972.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607289c5aa5c2---70824241802.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/71560725907.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2811f3f3174e5dc276079ea4e73bd7bd/96160962832.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/zenusutivefeg.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ng0q1v5kdcu0fpnhmpbk6e0i60/59350737551.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/410475d81e993641ac517aa3a65206e8/18680259420.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/lotoxupexiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=set+for+life+results+12+october+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 10672 bytes
SHA-256: dd4aeb349dd26a8f2d138075ebce35e985812b51711e1b35fc812182be9cf90a
font_01_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 17440 bytes
SHA-256: 78c8ce513b0078a5e99e08893c87f0c18e342b9de57e0efc682cf755f73f18b2
font_02_sfnt_off00012e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1