Malicious PDF — malware analysis report

Static analysis result for SHA-256 6213777b4e905f5b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 01:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 199b628219f83f273af33fbcd6efbb30 SHA-1: 781f99544015e36416b87b4b8471dfe30cc0efb4 SHA-256: 6213777b4e905f5bb9de1c5cd153d4b27c6b49a337e6bf00c914f25134542fee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic firings indicate the presence of external links and a link farm designed to redirect users, likely to a malicious site. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=pdf+reader+pro+lite+for+windows PDF link annotation
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a285c75988a---80444607580.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/nemelirebaboxoli.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021081105124992305.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/36dql9i1atllqqg1on7ht51e2e/tilupebo.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/61053740232.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5484002e393ec7a79a45b0a4de11b02b/70759340937.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e3b60d5f9ce274de8925164308e33e3/dibabamedodolexokegolu.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/affe1151e059244bbc4c0574ae9a63ef/ginejuzin.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/beef8eb06026d9956195895409e0fff9/51423863217.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/15639043579.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbac086fdc---xewefetozonadivibez.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/88335368077.pdfIn PDF document text
    • https://cmoretv.com/userfiles/zatelobesubiniwupegak.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2108070517300480767lg2g.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/24294482999.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/zujinu.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/mopesewururakiwipemud.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/rufosuxigidowitokeronax.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021082517413278.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dffbc932f36---54553756561.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14717459058.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/1e00e3e76cacb70f0e6c23528c11fb99/40290965594.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/22137218301.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/xugadabup.pdfIn PDF document text
    • 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_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 17476 bytes
SHA-256: 439b0e6ef60cd4a96c2ecec56b81b20c59bf08a6af4b0c323a2893654964601b
font_02_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 10580 bytes
SHA-256: 75e62a1b7e671f521dca132d6b9e0b767883f83de0cc41e9fcba0a172cdcc10d

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