Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e7c4ba1aac0eeb…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 12:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95f1c987a2c4d8f4e42cfb029638c2c2 SHA-1: 11cd884324e71f63061571d889c583b153a2968f SHA-256: e9e7c4ba1aac0eebdd8f3fb66c7129e88a08cd9632f58164792dae973a6026e6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to lure victims. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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://chcial.ru/uplcv?utm_term=i+spy+games+for+android PDF link annotation
    • http://bftt.marketsearching.com/upload/files/koxetozupigojuxeturik.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/14600635085.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/vezokusobigukogob.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/24604193566.pdfIn PDF document text
    • http://willbramephotography.com/55299398763.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8d1e8672d01f029120ddd940f7d6799/wumufigasetevomukasu.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/wotirugerufaga.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbfca9a0ea---lapawumukuwevozufutix.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/11097090214.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/bigam.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/51915616797.pdfIn PDF document text
    • http://metallpress.ru/files/jedopeki.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/pirerevalogupe.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/53009539231.pdfIn PDF document text
    • http://prestopc.it/upload/file/megoloxejoveputemum.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/nadorepon.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/gezexuwodubixosepun.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/57amolut5j1nds9pg5voucpagm/tetimadesu.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/82161771288.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/mixiw.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fojivoberilujuw.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/fodevasudowalajawid.pdfIn PDF document text
    • http://erpos.sk/data/files/96945801332.pdfIn PDF document text
    • 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_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 17472 bytes
SHA-256: c2959fc2b575ea3fb53331e65d6abfa8ce8cf2f621b0ae1be611a0da37c92b4d
font_02_sfnt_off0001295e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 10764 bytes
SHA-256: d8c55b43c418b8b01deddffa0dfb6bf9ab7632f3adfea67b25163ab8f32acf04