Malicious PDF — malware analysis report

Static analysis result for SHA-256 5539dcfd74f6e687…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 02:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c33b3b9d94c9229326a51449060c072 SHA-1: e5a831138b63ba9cc64a531b6abd39ed98923216 SHA-256: 5539dcfd74f6e687a1de9dda62a282c06f39e7cea4bc32467366dba58259a734
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users to malicious sites. The document also features a large number of external links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to obscure the ultimate destination or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=bloxburg+nature+house PDF link annotation
    • http://machulski.com/public/file/88181669886.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/wegozomavefodinirewuk.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/guxuwizepetezibevu.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/mosurelima.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eee977f04---10014486007.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16135ceee34378---banawavozifudazidigot.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/moxujuligenep.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/63077083361.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2f2243514fd1c93cda41f61eeac24926/valuto.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcd0f5059e---rapujidiwowejibugi.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/tamolizujejitipetitev.pdfIn PDF document text
    • http://netart.hu/userfiles/file/kaxagexipureluluxebaluv.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/pibif.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/30380422584.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/91099426036.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vigozesowofuvevi.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/c4vlmk1ph04aj5dtfahviusepo/tuzikuvitujenasosadugodi.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/97555544328.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kijarodo.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec3f10bc03---39611540082.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/28575069397.pdfIn PDF document text
    • http://rivucota.com/upload/files/84662196108.pdfIn PDF document text
    • https://noventa.cz/media/files/file/gewurexozukerilu.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_off0000d7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F5 18792 bytes
SHA-256: afcbe451d78b9392fa2b5ca8cf6fd6471c38de04630e87ec25b0847efbe67957
font_01_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D6 10692 bytes
SHA-256: f355e3f80ea2aceb9d3f6527b639880572ebe32c00f0caa2cb8c6417014e5ae8

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