Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9ad931575bf240…

MALICIOUS

PDF

88.9 KB Created: 2021-09-17 00:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 355d9e1e24e3f08ddb6931423246e518 SHA-1: 13a3a560bbeaa7005bb7bb8f3613c00127dcc584 SHA-256: 3c9ad931575bf240c696f0e4c2ba1c2e85a12f4876a1b18ba86f1ab27cbd71b2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to potentially compromised websites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of a link farm suggests an attempt to obscure the true destination or leverage multiple compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://brigitte-farner.ch/userfiles/files/xidumawukaf.pdf In PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/lemodepuwexudo.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/maninefixafix.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/mepinowuwojudidamupod.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/mumubanexaxa.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/15479316596.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4v1t303ot0hcl9gkhk1kr1rgpk/nalozoj.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/setanuwojedoxixax.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/14654166358.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/bipudenovan.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/wefilirabelogadu.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/vojoliluregim.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/81565536505.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/60778595038.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/bumilevol.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4a31f5d1---49547959994.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/8tinlpjriheqvuairhfem6hoqm/30003901718.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/wexurasirajog.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/xanawogozebolikizesav.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/vodoz.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dedbc852c9---buwejimajujuromuzifi.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/68968870727.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/57587935324.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/98711013123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=infinity+blade+3+apk+iosPDF 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_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 10860 bytes
SHA-256: 1230db6a32df37101bc77277c458b2c6841315b1772c2d641dd86e651c9c2c70
font_02_sfnt_off00012493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12493 18888 bytes
SHA-256: 6cd44b244072c761bca721132818886e73f932cc5c6f31bd15901dad68709fe0

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