Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bb6649b56e01da…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 20:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2bd4499e0a8b59509ab05be128164dd7 SHA-1: d90a82cb972f173b0c48b700bd42112098ac959c SHA-256: 59bb6649b56e01da407e02c8c98e13ef15e904efc71f68ad64133e7075f7bca4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lure users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=trending+games+on+play+store PDF link annotation
    • https://mediaskills.rs/files/zevunugerudanamot.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1c119056efed86d13475f62273f5cc8e/geforulilupawaw.pdfIn PDF document text
    • https://funke.be/data/file/nogebi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392abfd825f---sededikem.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/ketufowojirudodis.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/55141681100.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/91386473815.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/29157123379.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/74451872379.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/34965575735.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/bezetujalonawebudiwok.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/vemegavelovenixudibodu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613275f44d5a8---75069147099.pdfIn PDF document text
    • https://mimpidia.com/contents/files/13387353881.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/2331184604.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/38417973951.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/mogirizefipomefib.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/8mup907u8fbfq9lcg8ir9jh422/81051348036.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/8628013158.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/10380645110.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/golunelovenesaxitipik.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/sosawukesipip.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/72141272394.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/23774272574.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_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 18796 bytes
SHA-256: fc521f50019f6408e0bd7da5c7ab97a846b202a0dd16fc66726777db6030018e
font_01_sfnt_off00010b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001239f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239F 10812 bytes
SHA-256: ed1f58bdeca86a312734fda7a72193fb0aa3b8d98b75bbea4ed406f85c47a7ce

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