Malicious PDF — malware analysis report

Static analysis result for SHA-256 c211d6270eea359a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-22 10:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af17a44a97047f1d68bf508dd0d06485 SHA-1: a9c9c9f3f5ff606786ce2f2ae1f8d88f64c4dc93 SHA-256: c211d6270eea359aac2778d767d6ce442e74d25419383fe4f3dc820fabffcb55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The presence of JavaScript and external URIs suggests an attempt to redirect users to malicious sites, likely for phishing or to download further payloads. The 'utm_term' parameter in one URL indicates a potential phishing lure related to 'avakin life mod menu'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=avakin+life+mod+menu+xp+2021 PDF link annotation
    • http://csp.hu/editor_up/61937617770.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/34316324045.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/94934774299.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/95846825217.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/xovudapepu.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/40004565829.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/lufufowewem.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479e3a3d361---62570296258.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/11014745844.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/depunarepi.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/liwowipijexuredev.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/vilujajeju.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/56738265750.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/vizunogixujuwukifubomata.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/fafulelobip.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/s15m177pv2gfj5nvqlfqtf9psk/44582724117.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/54163923715.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/goledejiderarine.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/42217967951.pdfIn PDF document text
    • http://email-database.info/userfiles/file/toxila.pdfIn PDF document text
    • http://hjhchem.com/upload/files/pubonulonufiwugufubuw.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/tutifor.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16148aa5a84745---biwawaditawagubapa.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///2171330090.pdfIn PDF document text
    • http://e-sheremet.com/img/veremafimidibes.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/68823454323.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_off0000dfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 10928 bytes
SHA-256: b6749e81eaa3b171e3daec191ba6ce631a966a2b61d180bee1300a50f7e73268
font_01_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 17096 bytes
SHA-256: 81f5bdd00cc01e0ba1af27efdea1dcabdb71f23d63f8eda330183271b0d9de5e
font_02_sfnt_off000124c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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