Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef3b30595cce444…

MALICIOUS

PDF

91.5 KB Created: 2021-09-04 03:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f025cf2a5d1d727f63ccec5644872bf SHA-1: 268643757ba3515e7ed386226bf609976f972f49 SHA-256: cef3b30595cce444495b4a30042fc41fcd257d6ad521df7f4594dcaa092e1442
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and ML classifiers, with high-confidence heuristics indicating it's a phishing or trojan PDF. It contains embedded JavaScript and numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The PDF structure and link farm characteristics are consistent with techniques used to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://braghieriarchitettura.com/userfiles/files/jemazevatisusomidaxorer.pdf In PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d7aae8576---kafibemaxujedotimuw.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/88922756752.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/sojivoxuxide.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba880bc2c77---fulunufu.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/zupujuxedabiridufitolu.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/78332958353.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/malezigikomevomo.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/liwefim.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210615041733892.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/81664615325.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/gotipi.pdfIn PDF document text
    • https://kultmotor.hu/images/files/kegavedatololu.pdfIn PDF document text
    • http://miwon.vn/app/webroot/uploads/files/18118996247.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d931effe9---92063327489.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/35728271875.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125bfc8df7a6.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/4637410433.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962f971b707---mukibuxipeloligegedemedis.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/zemijofakol.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/dusenutufolo.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/xosodulexuzoj.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/pewuve.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/68810912708.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5a534fbbf---gabolopopalu.pdfIn PDF document text
    • http://remobudostol.pl/pliki/musoborigaraki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=anfotericina+b+efeitos+colaterais+pdfPDF 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_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 10732 bytes
SHA-256: bf5da7930d95f6115e3bc09d66eb3a1fc61055845bc32c0138d27976bb47f538
font_01_sfnt_off00011780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11780 18500 bytes
SHA-256: 4290e1c00f8d449badb5fab6306b544eb9b3369b431bafee9898d4c7224f82f0
font_02_sfnt_off0001477b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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