Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cf6ec19d2dace7…

MALICIOUS

PDF

70.9 KB Created: 2021-10-09 19:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 1a2b7f6f3fd95c3872b52a46ce6d2f2d SHA-1: f66eb9d42e49361ba7db7fc3aac08cc345d277ac SHA-256: f9cf6ec19d2dace786ee4a55bfc7bfda2926e0b13840361072941c74a52065be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript may be used to facilitate the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/cd4964c429f475cb7ddd842183bdd5f9/fumudodisofikeduwid.pdf In PDF document text
    • https://weldingportal.it/userfiles/file/pelugezarebimowas.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/bigatevanonisagezujer.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/74590891057.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/27168251478.pdfIn PDF document text
    • http://wdnederland.nl/file/48933801670.pdfIn PDF document text
    • http://4bx.pl/public/file/gorafuzomuki.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/melagovorukavekigagok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc82b8e5ea---147938049.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/sakek.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/vugopeb.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/93900923108.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/daxemo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161453e7702fd2---lizexavobexu.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/19304130666.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/woganexuwere.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/mowefukenafi.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/53646116912.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615721c19a9b3---fuvekogexop.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1e01d40e9---70143732801.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/tomavufegevoxepudotevotev.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/puxidufijatetabut.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/20058108263.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/gilaxaperopidisudibuber.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/voziku.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/revemalurozexabebok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=integrated+access+controlPDF 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_off0000ba5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5A 14328 bytes
SHA-256: f2e6d3d0348436e30e7efe1fb3fb4d20de8ec2d4a06fcc4ecce2f59931bf9798
font_01_sfnt_off0000de35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE35 10404 bytes
SHA-256: 855364ed344375fa92a6b0179684d4089691307550c9d87e6fa94cc479a24cb7
font_02_sfnt_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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