Malicious PDF — malware analysis report

Static analysis result for SHA-256 077eacc4424a7ef7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 17:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5e350203b2284bf530459cb76802ee07 SHA-1: d947d471f577582718be8767fd4315f13f228386 SHA-256: 077eacc4424a7ef778d21c6cef8a7b7ab264e8de13bc34c06af19131cc6b05e6
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings and URL analysis confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://gddfboiler.com/uploads/files/88744871728.pdf In PDF document text
    • http://juha.be/_files/file/73582127708.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/xefufakuvurosevibori.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/gulanitipademopuvegexa.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/5k4o4f67g7ejs7peuq76kjr9mp/fopag.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/kabukugomasikizonud.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5b12b539---wepalumofupovesunapusu.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/63049707909.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/1935300710.pdfIn PDF document text
    • http://accronline.com/userfiles/file/sunarokuw.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/1012599812.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0557a109b8---moberimu.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/vijamosofageri.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1284b02c---54385126837.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d627dbee---lozaxejekatufujat.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/20836158871.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/v61bcgengm1itjoeut0qb9n107/82524274502.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/xakur.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/1mg70om2miispjv326iqmjvd62/geroforoxuw.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/rubunakeweve.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/24925223420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=forensic+firearms+examinerPDF 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_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 18908 bytes
SHA-256: 78a5ed2c19990941264122d834941523d51ff3bfde79e80236ba1739b8ddc614
font_02_sfnt_off00012332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12332 10432 bytes
SHA-256: 62b44fc5f5af6a265980d4e42f651f7e5a48b4484dd9e2f0ed6fd1a76514648b

Open this report in the interactive analyzer, or submit your own file for analysis.