Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb913b032dbf22f8…

MALICIOUS

PDF

77.1 KB Created: 2021-09-13 22:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3985ddf0ea414193efe1dc4e62a32ec1 SHA-1: d18271c94bce417790d2096b530b99a1d9134a43 SHA-256: cb913b032dbf22f8c6947dcaf59cf65992fa0b0821fdcc98b1ae807884e518ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing an embedded JavaScript stream and a significant number of external URIs. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://medvor.ru/uplcv?utm_term=badlapur+full+movie+watch+online+free+hd+720p PDF link annotation
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c840cb501493c01a628f392f4579d638/redelopurizaxomevi.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/30227449239.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/geraronikozusenazun.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/81097792100.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6hs5mk7egesfj7ho1h195qhc82/42785232191.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1980cc4918b8e0ba47b6e483b04c6bce/82913316682.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/xegaramopibumopedalu.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/bogofi.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210905211624.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/sunudawuvejomujutub.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/633e6640fe7c9fd6f9d42b17b4996da4/58941101893.pdfIn PDF document text
    • http://machulski.com/public/file/laxovuvasif.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/dikaxeguvari.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/tarisurexilelawunutif.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613686ba84be0---nosirobakuzetilijufoxoze.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaafe6afc9---17805499763.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/18323133145.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/xuvikoxopuwomevoje.pdfIn PDF document text
    • http://premo.at/userfiles/file/54188272138.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/sipiritanex.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/somisu.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/61979178463.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_off0000c772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 17424 bytes
SHA-256: 3091b6ce7da505d867855398c5fb0552d5ce370513a6ddcd7449825c2d46e6e7
font_02_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 11312 bytes
SHA-256: 73154ac914ed37765f15dc39d81e5a5650fa57a1bab344b423d5c8c0d8198063

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