Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a90906bc309b4f…

MALICIOUS

PDF

82.7 KB Created: 2021-07-03 18:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ace44de1a36f5cb1563e5eb97ab9f5f8 SHA-1: 2984b4c2e0fd38d54e8f4382678b809fb82a4e2e SHA-256: d1a90906bc309b4f5f7307b891894c82c5e9c03f895032a69d7a7edb0ff9f93d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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 http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098330e80aec---32479099408.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/58b70007ceaca547038e2dbb563dc121/92957570239.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7df9d3f6d918d7e13330fcab9cf7d499/dexakivo.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/l0vld5hmtujoehevi9s1ku16t0/bovezubalimawuno.pdf
    • http://mg001.cn/upload_fck/file/2021-5-13/20210513221001501631.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/c26e0a66cc7a9fce9ee151cb06cdb94b/lulojalowuxu.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d76cc4523---bejanubunatotewusadow.pdf
    • http://dansecyr.ca/pdf/file/59537873622.pdf
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/zelawotijanilamo.pdf
    • http://serramentisiciliano.it/userfiles/files/vojagarosef.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098a3d31e15c---wemujeje.pdf
    • https://magatek.com/documents/file/wonotijokesulenuko.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/mocibiiv1e5f3kr9eqaoped1tn/fasajo.pdf
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/jabuvo.pdf
    • http://aggengr.com/uploads/CMS/file/fisulu.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608be5db01862---17171452442.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6pek11cck7frssji2jbrias2d9/lezevubotejefomikadejag.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/s0q7eo4dil45gukl1gcfi798a4/jogivomazufilepag.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/67f5e443aa559153cbbab36e63a95c98/ralekorasiz.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af2beba79ed---8797357367.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b19038ceca2---bobamilejazifaredane.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=minor+scale+pattern+guitar
    • 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_off0000e189.bin
a1d5dc9b87d1965cc08c53f3ad7873247713d21ff5e20ef96a857186fff353ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 16780 bytes
font_01_sfnt_off00010d68.bin
ae458483ffa140d8986f70b6609b71433d1bfae1a87aaff50ad035036363b6f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 10644 bytes
font_02_sfnt_off000125ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125EF 16792 bytes