Malicious PDF — malware analysis report

Static analysis result for SHA-256 526b3cff626bbcd3…

MALICIOUS

PDF

93.8 KB Created: 2021-07-06 21:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76d02f44a881fa7a5e144baf218d3a3a SHA-1: af611dfbfe93f7a1e85d9968ecb7f32ed85fb222 SHA-256: 526b3cff626bbcd38506f1173415273f66c3bbab9d7b202965f7d4b4115726bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are hosted on disposable domains or compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/87deedef7391f3f0cd6b84a388337b6c/sovorijawedevedabe.pdf In PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/68562682780.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/1be5726f11b3439a96ee402f3023934b/samumipisosizo.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/22198381517.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b69712c93---poxesumefarekanexagozafab.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/gufabaxuw.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/jejikiwekaxovek.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/fusubixat.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/58786660775.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/bufifibamikevopib.pdfIn PDF document text
    • http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/nunimo.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/796d3cc595efcae54724bb95ff21e561/xekubipelezuvupukudobaz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/72234281544.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/33114694751.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f97148d4b---zukalizajepenivoririgitag.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/18800723118.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/zaxexomoziridirivaf.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/60200190723.pdfIn PDF document text
    • http://candientushinko.com/images/file/mogesifawawutajiwokozigo.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e6816d2f55678a335018096888088d05/23599376063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=where+to+report+landlord+abusePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 10632 bytes
SHA-256: 597cb28fbbc6755133abec35adad1868d9f49ec0f8435636129f173331b953cb
font_01_sfnt_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 17004 bytes
SHA-256: da864bf0d435e555d9d450a73b2c669f77493b7fb5ef7abe9e88caa52ceace8b
font_02_sfnt_off00012482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12482 17132 bytes
SHA-256: b471a4300e1b31cdc523cf5b7e9309fb5babdcf2042a82eecc4eed94a1d2c82d
font_03_sfnt_off00015160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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