Malicious PDF — malware analysis report

Static analysis result for SHA-256 18080f18cc6ad441…

MALICIOUS

PDF

87.0 KB Created: 2021-09-13 12:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d88fd46d3628ad035af6ff5c8bf1b27f SHA-1: c0cc4c0265774bc7baa1fe82a3fe92567dc64e99 SHA-256: 18080f18cc6ad44168da88fd1d3705ce6a53e811305505bd4fd2a2c1bab024dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=download+stickman+fighter+mod+apk PDF link annotation
    • http://ydyb.com/filespath/files/20210910135658.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/53683740616.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/jejeluxexu.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/fawisakojigizoxujin.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/vuxesatiwoxusalasi.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/zomomemipaf.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/volepodiraduripotos.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/93948526363.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/98084509456.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/41252537027.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/womijaxizavemitezosaz.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/5237326770.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/78894226003.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210909_CC2B56ABE3AD8116.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/vozosemazisodinil.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/97907338098.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/72630551811.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/kebepafema.pdfIn PDF document text
    • https://jck.ro/userfiles/file/58313588705.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebdc2ba7db---89209030185.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/90974918221.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4mrh1ctdeqqlgr1s83li9u8huo/70531835469.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rs38i07s1f9ae74haqm2hjudk5/bibezuzi.pdfIn PDF document text
    • https://go2germany.ru/files/file/49157221521.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3B 23300 bytes
SHA-256: 8782705434cd86f16a8ecfeee21fe7a660303f7e28b59cfb6819f17989ec92b9
font_01_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 16376 bytes
SHA-256: 1f13e1e3de8c3ec80aaf7caa715cb6ecc383a938f6e6bff1aaa22934be700bea
font_02_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 11244 bytes
SHA-256: 3764f4b92e7e28d96ce389f0ad0de5b615475bb7302a3de497f3b65bc3e2ebc7
font_03_sfnt_off000135bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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