Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec3cdb2ea398070…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 04:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 13270e11b3631204bad2e4e887d1f32a SHA-1: 9480c12bab17717a0c26234f36f557a5ba0170a5 SHA-256: 7ec3cdb2ea3980703af30ab28b1bcb5273a3e1a2244e4a834e3258d94c0b2cdb
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, identified by multiple heuristics, which is a common technique for executing malicious actions. The ML classifier and ClamAV detection strongly indicate malicious intent. The JavaScript likely redirects to external URLs, as evidenced by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings, which are often used in phishing campaigns to lure victims to fake login pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://taixingchem.com/uploadfile/file/20210909041225334.pdf In PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/zugov.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/jibiwewimipitokijapufiful.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/1200927146.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/bifizevaluroravimujoju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c515fc336e---45337273082.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133821273748---1100969182.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/zuwilatumefukifafixekajig.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304bf91bc72---duduwabazobozew.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/93237807328.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/11496417713.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/jasave.pdfIn PDF document text
    • http://mcutech.net/files/85436574288.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/fiwexolevidozibe.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/96659134164.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/nidepezozumaxopuloguvup.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/gusudituwuvujanemikanesu.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/suwovazobozezevikino.pdfIn PDF document text
    • http://shopabrang.com/images/files/9069087526.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/70fe06740ad6115e626e304393f9667c/91606151812.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/56346407732.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/wiroge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=app+ngulik+ml+apkPDF 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_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 17796 bytes
SHA-256: d3d541e818f45930c4813ca7bacac4af9f4af6e3323cd22a38030dbbc5f677d2
font_01_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12247 10152 bytes
SHA-256: 9f816a95420fdb75e52b4b9b96de1d1f11f6e53c97ddf971563d4ac40710c6b8

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