Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77604ffd0c44e96…

MALICIOUS

PDF

87.5 KB Created: 2021-09-19 17:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd431b7240954ba6a0586ee29793414e SHA-1: 0721b36368d0128886a48f190ff1e92c3c394403 SHA-256: c77604ffd0c44e9648cad403f0e29b48371d7f32ca05282a1415f0571b2c73ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://irlanc.ru/uplcv?utm_term=rocket+royale+mod+menu PDF link annotation
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n2jedt243gnerobmsmuvlslj40/godiw.pdfIn PDF document text
    • http://a899.net/userfiles/file/lovelirobixu.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/valovurapopajiworise.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/nolomifisapatis.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/maginasotojidopuxa.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/92689980236.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/duwotilabugaxalubogifera.pdfIn PDF document text
    • https://mimpidia.com/contents/files/gibutolupe.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/77783589748.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/93566034120.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/mejebolukokikivanop.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210905_13FE956F336A04CC.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/goxabinoduz.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/87891487377.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/guzop.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/wotujojesaledariru.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b08f2ffea8b1f0cc6b21f10a557749a7/wanaguvilego.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133f7ae19bc3---8401692530.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/jesabibo.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/sojejiniboji.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/waresonixukidog.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/xupagafutupevukewe.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/66433178844.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/60626350876.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137da3c58022---padivatapi.pdfIn PDF document text
    • https://ms01bet.net/contents/files/xasimu.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/naniraseropulerefebebipef.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_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 22572 bytes
SHA-256: 8f3ba1704ca9a61629d9e02c8f86e1cb8ed2eeb7503faafc8b3f0a3ede4aee59
font_01_sfnt_off0001202d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13844 10624 bytes
SHA-256: e86af464ac6f6e510ce3c77196624d0936382db0d537818f64fed1516cb0afc7

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