Malicious PDF — malware analysis report

Static analysis result for SHA-256 943528f0c340a302…

MALICIOUS

PDF

131.6 KB Created: 2021-06-30 08:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9009ade0c61c13b658772832534abe2 SHA-1: 4a2d3b9c37e3423382e23672f88ba462a0aabd93 SHA-256: 943528f0c340a3024eaae302d1936c498dc6746d3fbc101b081bd287ce685c82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to multiple compromised WordPress sites, likely serving as a lure for phishing or malware delivery. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • 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.
  • 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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/43d9a07628af816c88e695ad0c88db46/zunademi.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hj5kkvfnh40kijrf059rj1e8sn/gebonuwososatobifutive.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/92937073492.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160847e8556e42---61924997449.pdf
    • http://aliceinformaticasrl.com/user/pages/nebujosanelodimef.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/a082io0ebuuad9n732nbuh52je/77948457693.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/63cd7393dcc276478ab205331275a7e3/gisifegonakudefik.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/cp360o5phnnea1d9sdpe3c5g72/taregebakofosuwub.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c4b61a3ce10a93e83f90c50a1ea9b095/35784928495.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vsk7epmuvv1bmu3oai70qbrvu4/zotiro.pdf
    • https://ewastexperts.com/userfiles/files/56910047077.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd100953a---rogevomunivof.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98ca5e562b---jepigafupemegejenaxadava.pdf
    • http://morecoredesign.com/images/imageUps/files/nabowulug.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/dofozodeledivexoxafewagi.pdf
    • http://malbreil.com/userfiles/file/10361755394.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a18418f21ca---58284749839.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/a3eo4cqb1e52nc34en6ool6dj1/rovulutavowepu.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/eb89e0bj4bhe6b7d4iom24i7od/nonasiz.pdf
    • http://curry-box-deluxe.de/userfiles/file/suwubuwajofaduxo.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/g2bull5i2bfvn3cbgan5ksmifm/5621118186.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=driving+in+italy+which+side+of+the+road
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018ce1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18CE1 16792 bytes
font_01_sfnt_off0001a4f8.bin
daaf0dab7fd64ad893d63543e93285900d14511852575bdf056f90299680d4e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4F8 11024 bytes
font_02_sfnt_off0001be64.bin
6f4cb87518ccbf024125d8aea4ae44aa7dab66edef4e21881be96bbe1327b989		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE64 4040 bytes
font_03_sfnt_off0001cdaf.bin
c2ce4a9794c5f57fd66548896ec3a6ccf262926914b729b08f99f6b832c73440		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDAF 20508 bytes

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