Malicious PDF — malware analysis report

Static analysis result for SHA-256 2baafc99f727a4d4…

MALICIOUS

PDF

84.3 KB Created: 2021-09-10 22:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d2544eec848b9ea0897c4bb27c10316 SHA-1: 02a5336426c386f323cfe9cac6d23e3ceea25334 SHA-256: 2baafc99f727a4d49af9cd1696afee4ef649a4e7cbf2e5630c26ac476b1710f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external links, including those pointing to compromised WordPress sites and disposable hosting, further supports a phishing or malicious redirection intent. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://y3stwk65l-mn9.com/contents/files/juzisojuwexawefa.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/72590149ff0e0ffecb8855e9d3ed2b2f/digagifan.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/96583162527.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/tawivasabelasafawizo.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/finurakasovobufeponewab.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/82135871465.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/biderufebewu.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/kkulhhsu6e51ao68tl0lib0i76/jodetewetubufurufopogukug.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/tanimaleterule.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/bubatolenodarepadipe.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/79066424977.pdfIn PDF document text
    • https://superchills.com/userfiles/file/67104943009.pdfIn PDF document text
    • http://newo.ru/files/files/wepetodetowibukuteriw.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/faludu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383bdb23b79---fovofevofebi.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/39729523350.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/43942749887.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/72052214386.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/xumaxodexubomonolebu.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/77898407962.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5a2d74a5d---sinurasigudidosari.pdfIn PDF document text
    • http://podarox.ru/public/files/10394552638.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/97941196016.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/dazozej.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/85363936703.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/fomubotimodarotalix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+send+message+from+android+to+ipadPDF 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_off0000e007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 19064 bytes
SHA-256: 8eab87531fdaaa13773e3d7ecfb195ec44241484d56213c412de0e154e600fd0
font_01_sfnt_off000111bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D3 10872 bytes
SHA-256: 1f9807a65494973c62cfa352a60946358be0ea33d88eb8b74711ff4673a2de01

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