Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf657782777f1bc2…

MALICIOUS

PDF

85.4 KB Created: 2021-09-11 23:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2c8c80c8b7520d7dff90e08042ff048 SHA-1: a3e17937ebca8239dde3e424078b38f90bd629d3 SHA-256: bf657782777f1bc219defcda8313e0adc19f455116501841be751dd5fa3dca57
196 Risk Score

Malware Insights

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

The sample is identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social engineering tactic to trick users into installing malicious browser components. Multiple external URLs are present, some hosted on compromised CMS uploads, which likely serve as download locations for further payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://garglob.ru/uplcv?utm_term=how+to+get+rid+of+pop+up+ads+in+android PDF link annotation
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kibefogebofud.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/0b5ba121bddeed04055455fab4aa8116/nigafuxofakisewulazutak.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/15722283417.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/be0a6b9ad2286ff7e58a5839a16427aa/32701001273.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210908120701.pdfIn PDF document text
    • http://hidramaco.com/files/files/fadakekam.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/26538557813.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4bfcc6ea---fifemaxodeke.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/85387748132.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/sopusiduzinigebexivened.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/13b681910e6243e64f867378adefba45/nikunararaf.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/56892704113.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/zujiselalubamo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd56a390e---79512230000.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/jalemorujiwitegoburodibut.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161397ab7546e8---41194368622.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210912044351.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/78001862130.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/30018366031.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/ragalarisokiliji.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136599a6a497---nawonenudunemedekalijuje.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/84aade4e9b1999c772540ccd90cb0cbf/saxuv.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/99456618385.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/78095829783.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_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 10804 bytes
SHA-256: 45cd3cbed0946f9a3d5af80ae3bda2b1959c474156dd25ceafc67229a3a67e6b
font_01_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 17624 bytes
SHA-256: 7eeea39455370cc356f7d13636e89f010420d3e0e7caca469817a23c92ffaa4f
font_02_sfnt_off0001310e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1