Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3291126ff4e113…

MALICIOUS

PDF

89.9 KB Created: 2021-09-20 20:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 534c915bb4de9b96923fb109930c341a SHA-1: f8f3f500f1e9804583c6b46819563cb8314a70fc SHA-256: 1d3291126ff4e113a12f3bd7489c2574c7a2793764fae3a6e819d634c5d79e24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The embedded JavaScript stream, while not directly analyzed for malicious content, is a common vector for exploiting PDF vulnerabilities or redirecting users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://infrive.ru/uplcv?utm_term=unturned+big+metal+plate+id
    • http://www.morrisjones.co.uk/EditorImages/file/62074409615.pdf
    • http://uk-finansist.ru/userfiles/file/nipubobapuzopuzu.pdf
    • http://laihoawedding.com/app/webroot/upload/files/ninuwaxozusofutesaxubuzi.pdf
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/lagubavukapawufumuxa.pdf
    • http://pomocnaukowa.net/Upload/file/31777208074.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489798e1263---gudofinoba.pdf
    • http://abwalabamaave.com/uploads/files/43978570115.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/kinuzabifafixerodi.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/guwovadirawiroruni.pdf
    • http://idealthailand.com/file_media/file_image/file/69451137189.pdf
    • http://mikailang.com/userfiles/file/20210908101113_381932302.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcb7c14e5b---xekepogupi.pdf
    • https://unicorn.mn/js/ckfinder/userfiles/files/41354445095.pdf
    • http://haai.org/upload/file/pofofedolez.pdf
    • http://aiaato.com/FileData/ckfinder/files/20210906_3DE921BCE5BB5731.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/7757765665.pdf
    • https://europartner2.pl/uploads/bukatisowesezomedofu.pdf
    • http://nhasachthunam.com/upload/files/wiwavopivivurusazitemeter.pdf
    • https://deitratech.com/userfiles/file/tenoxelikaxux.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/01nappu5n404aqm4rud4l8ueg5/titifutenexosuwupawu.pdf
    • http://asckhn.com/acskhn/userfiles/file/ragafiwozasinukok.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137942dd3b92---terexibefugokuwexi.pdf
    • https://lederstuhlshop.de/ckfinder/userfiles/files/tafetewutitupenekakig.pdf
    • https://sofupingame.com/calisma2/files/uploads/72421052821.pdf
    • http://gemaeldeundobjekte.de/uploads/files/6567839612.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 16792 bytes
font_01_sfnt_off0001121a.bin
2c0c9c057442ba30834812aec5deeef11a700a19f919bed45bec91a795a23af9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 17672 bytes
font_02_sfnt_off00014027.bin
4ccebba971c7a2288ae7129bb16bd64d4c501dfa0a7511554c7161d715ce493a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14027 10696 bytes