Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd4a85b26cbd9db…

MALICIOUS

PDF

81.8 KB Created: 2021-06-27 15:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a78251e8dffb4adde2a903c5a7ffee4b SHA-1: defdc8e43945739a0a5e76ef6db486a59c68c1bd SHA-256: 7cd4a85b26cbd9dbdc87ea130ef3ddc8f7af399566b8e1b7f1e35694a8396283
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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
  • 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://crewmak.ru/uplcv?utm_term=greater+swiss+mountain+dog+puppies+indiana PDF link annotation
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1eccab41a0---fagebokudofapeniw.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/dumovow.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/66900599275.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/m40tg39rpariih5jgq0a2lp05n/tumajiji.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/dc4f5c14289667688b2b047c187f51f5/tenuzupusowil.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/1799917167.pdfIn PDF document text
    • https://blogsma.com/files/90692553404.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/18594859279.pdfIn PDF document text
    • http://fotossc.pl/_files/file/wuxuxesibera.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/pulobezanoboguxemola.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/fipexadoxerixuf.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7096a71dd7b9a53210b632b770c88361/78996249892.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/35611795902.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6ae74f37dda663dc8d6f18503c7c390c/fadajotekem.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/79466937153.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609839e760d62---3703031307.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/nonuvuvejega.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afde600cbc9---fafujirazibupujixupawid.pdfIn PDF document text
    • http://medica-brno.com/files/84343493886.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/81318604817.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/luxubewawapu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a153014a2---vulesuxokefusowelivex.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/zetodetekexisaf.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9edddd0d5b---joxibalanedaxir.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/03ea5f5c11f1a004b47ccc7576c33eeb/2340997134.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b3cce28eb---88638810000.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_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 10912 bytes
SHA-256: be68f8fd6d557d41ff4c8608762b40b975911172d5dac54ccf552f2391b73397
font_01_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 17144 bytes
SHA-256: 5a1c7857e567124864888b2a64437640ff18340dda3e76aad2987990cc683c46
font_02_sfnt_off000121b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1