Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4094a753142d927…

MALICIOUS

PDF

87.9 KB Created: 2021-09-18 18:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5122b6f58f7582d7c33ec70bc56839db SHA-1: b6fef2ab3931e1cbe42d58e0fb2f954a90bdfd3d SHA-256: a4094a753142d92728438724328b2b98e90aee9ba8223049974eef7edcfb00cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely a phishing lure for a fake mobile application. The embedded JavaScript is likely responsible for redirecting the user to one of the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://queure.ru/uplcv?utm_term=mobile+app+for+android+and+ios PDF link annotation
    • http://nabisori.com/userfiles/file/21049302545.pdfIn PDF document text
    • http://candientushinko.com/images/file/84370614138.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/nufoxoduwivopejoxilisebe.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210907055709.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/goxubebow.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/webuwanirekisawagogiwa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/81312995716.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/radaxufexiligeg.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/lisogamip.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/gawimimovobij.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b8381fa4d7a96abaf9a66379c542ac43/pevugepujamuz.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/17306811280.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/43706369888.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/92177452754.pdfIn PDF document text
    • https://polytex.de/sites/default/files/kirixojiwufonekoful.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/tijevokom.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/18335763912.pdfIn PDF document text
    • http://protezas.lt/i/File/dimasedemuranomewabixuko.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161376d216c4ad---vonurugu.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/kikazilafe.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/66335652625.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/masosejonedevapiniv.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd62f3c178---kovidululusawop.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/wojexuxeposifokaduzonew.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a3d5024a0---fodapufituzoz.pdfIn PDF document text
    • http://ubest.ru/images/file/lusuzopunit.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_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 19180 bytes
SHA-256: 5a81b704b2b1f92faadfb1ffe4d38622c3098a0db0f8ba4679f507175a2e47d3
font_01_sfnt_off00012270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12270 10524 bytes
SHA-256: 672a89b2aa983302f7ecbccb3c9fbc82137a775e7ebb2620f0fe13eb57f70e6b
font_02_sfnt_off00013a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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