Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15c115f44da8cc8…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 20:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d8959a95783272870c62cfe138b2750 SHA-1: 0274318168eaadda07b76d4647ecd1c4da6ce1e6 SHA-256: c15c115f44da8cc8945823de5c97257134de2c48598434fa718440ba65000c5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to phishing or malware hosting sites. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=free+watch+one+piece+stampede PDF link annotation
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd70d84309---3979398646.pdfIn PDF document text
    • https://keongracun.org/contents/files/woduvi.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/59237574733.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/79451335681.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136703c9ae18---dojiwigafa.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfc86ce6a4---tajedasixinazufese.pdfIn PDF document text
    • http://travellerisland.com/files/ponev.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/rokimoxuvudifojof.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/6784744244.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/99361006626.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/zefili.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/17313157840.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/kolumajifinesoxi.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/gagafosuzatagixamolav.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/67231147151.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/70324483005.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/jodiredikefote.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bef04c7f51---semezano.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0b76ee5d6243cf33133e781c2799893f/40861505186.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/79361232404.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/4933466927.pdfIn PDF document text
    • https://peterdegendt.be/file/43415552228.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_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 17104 bytes
SHA-256: 572435b77c57c773f4f7582d4e3b17ab5bfa6ca5ae840ccc8570f0b4fa97d9ad
font_02_sfnt_off00011e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9A 10796 bytes
SHA-256: c77f773fce96f363cc3402a67d442ea59896c89e98eb028f0e96f849a1f4e130

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