Malicious PDF — malware analysis report

Static analysis result for SHA-256 58dfcf752655a304…

MALICIOUS

PDF

72.1 KB Created: 2021-09-29 05:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f534a89821575206bbbc7d0148b7a748 SHA-1: 9dc96b4e8d04977cf090d6f3495fa0b17f92fc30 SHA-256: 58dfcf752655a304be87e3042faf2f49a6556a18dcecd8be6e290153c5133de6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI redirection. The embedded JavaScript likely serves to redirect the user to one of the numerous external URLs found, which are often hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of external links and embedded JavaScript points towards an attempt to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gocoachfox.com/userfiles/file/98025857593.pdf In PDF document text
    • http://leebyunghun.kr/new/upload/board/files/61500460968.pdfIn PDF document text
    • https://pecintajp.com/contents/files/wafovudoviduzamewidiz.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/2445907203.pdfIn PDF document text
    • https://www.znackakvality.info/files/wiviripujima.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613a423d0ffc4---71800635718.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/kejagoxuwagifikuk.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a9495c46c---sagoxituvulo.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/86151994849.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16152e5d03ebba---80991240812.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/32768547070.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/50787987826.pdfIn PDF document text
    • http://chamdure.com/DATA/files/91274226104.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///bovezikawedopilib.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/95095209121.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/39678857234.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/gugulejuxuteloxe.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613544f9bed9f---rasimokamisefe.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/reviwulazetutakamit.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf0aacabea---41297162068.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/lipofuxaguxul.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/13836645357.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/34315378860.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/fubugozifonokog.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/54460236197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+view+multimedia+messages+on+androidPDF 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_off0000b669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB669 16872 bytes
SHA-256: 473b5a34cfabfbdf19f41979dee4a4730dad01ed5befab4996b12b7d5c05ee31
font_01_sfnt_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 10836 bytes
SHA-256: 08c10343da6470db5b29d4e98877304ffdd2ed3a3317b5b2510b55d6db1aa5dc

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