Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd34ed1df1cbb667…

MALICIOUS

PDF

91.8 KB Created: 2021-09-21 20:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6fc312c04901213509ec08c7fef5605 SHA-1: 6b096ac0f6a54a571595bf8ac535c31c681e1b6e SHA-256: bd34ed1df1cbb6670bdf4aff222762ab4ce776f36609eafa413d9377ae7025c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. Heuristics indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious documents or host phishing content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://catamma.ru/uplcv?utm_term=still+receiving+texts+on+my+old+android+phone PDF link annotation
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/66772992940.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/79439789454.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/ratixasamatoxadolawexubox.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/40905398205.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/situlisokulixe.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f279e1eebc---71797156853.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/vokolelenutazesidetirodu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/g41uv2fph7oqdhoqk6qpoqkgvk/valuji.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16149cda8295c9---61740211899.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/867aa65c2a6262ef1cd1eb59e27d10d6/29958952515.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/41863858053.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/5141917843.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/424786675.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210905161424.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210907052756_ei0065.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f48f548c605901a1df9a7704c6880f73/ketoko.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/72025191480.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477c5e24106---tabesamedugopuvaxukonuxuv.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/fewirepuzotabemup.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/sepatunofukivowefavubag.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/5800926717.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/nusanobute.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/94770810181.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_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 17620 bytes
SHA-256: 1b2719e13bb7f68b4e9b95075ea2a75d90a8362713bcb004a2996c45ee43c4d9
font_01_sfnt_off000114ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D04 11316 bytes
SHA-256: 2c6d56692db956c80aaa84bec5bce8e4f56ff3e3cd7c8cd3edb308c8e8c11284
font_03_sfnt_off00014740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14740 17272 bytes
SHA-256: 508bfc5132d46b15c5262d86d10755a335c5cbc9124d823b212767fe31484eab

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