Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f79f97c00b0f8b…

MALICIOUS

PDF

89.4 KB Created: 2021-09-07 16:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 39516260612a78f2d48b6f28f9e5914c SHA-1: eff360db7cab2219acc0cb76057d147cd2aebe03 SHA-256: 13f79f97c00b0f8b9e38770c2847c68a3928552cc2966be09f4106813fbc8500
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to download additional malicious content. The presence of external URIs, including one pointing to a raw IP address, further supports the attack pattern of luring users to malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f259dc00c5---99102921036.pdf In PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/vobavinafumiz.pdfIn PDF document text
    • http://gardatrans.com/content/Files/84985820823.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/19770973257.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/52519582761.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070ceedaa35e---89130458289.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/11274098040.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/zexenigamosojadeveporet.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/23984501800.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/lorerarubukelufun.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210522015923.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/44583877681.pdfPDF link annotation
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/555ec739d258e84f5218fd549f0c8cc7/17657018552.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/132d82f976d124330ec3a9a66ce5a281/mawumilodeki.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/57267430182.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/rojalela.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/36217618759.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/retudeduwe.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16117c75b1c2f5---ropapalonug.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/nusanedawevepukowomotiror.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/surawimileriv.pdfIn PDF document text
    • https://maclashoes.it/file/73219234875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=valeriana+composta+bula+pdfPDF link annotation
    • 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_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 18652 bytes
SHA-256: ca93656fc2aa89e2f10988217c9c16714b56588f5451707c30806b5564dfdca9
font_01_sfnt_off000126dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DD 10988 bytes
SHA-256: e20992ec239391b6da2068550dc4fbc9bfe629b25421a9d657614777df1301ce
font_02_sfnt_off00014022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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