Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ac0d2ccca882af…

MALICIOUS

PDF

156.3 KB Created: 2021-07-23 17:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c4b598f1c8c9ae99e77dc96eaf4fc528 SHA-1: fba24653ff18b3e15fc9d7503988ef399d43eebc SHA-256: e3ac0d2ccca882afa4bcaa3cdcdc2d5e71c4d0cbb9d5a595107591ca24f447a6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting a link farm or distribution point for malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the 'Password-protected archive lure' heuristic suggest the document is designed to trick users into downloading and potentially decrypting a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/poxobobimoxowasuxefepajut.pdf In PDF document text
    • http://minerva-collection.net/files/files/baxulukapunitikavi.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/95150157996.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/37548513575.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe1a9076b4---wulewemularibubizakibemof.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b682ee22146---sunazetajikepesimixe.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/gelilomusuvutudade.pdfIn PDF document text
    • http://st03.it/userfiles/files/wilulekit.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/nr5gniohec6het0vi520m6fe77/nosoluginutut.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704cb717be5---50156933598.pdfIn PDF document text
    • https://businesslife.com/content/file/ziwabixuxez.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160885f91526d7---timefala.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/55675943494.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/guxagowezafugofixela.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/0bgtgimk0c9568pg2g7fn17bte/48376755138.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/3ru1doffkgkc8pgrh7q2ecpdaq/buguvegidoxasabovuvibe.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/92e71b40ac9a0c27aa4e4195f6ccb01e/55996930242.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/zuxegezikuzetisodexapadi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a56a558c4---zekarezilexenibuk.pdfIn PDF document text
    • http://heizler.hu/files/file/48814917904.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b2ebcb87d19c7913f1d33122bd0b2ab3/susimofemiwoxedurigegu.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/67968334774.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/xutusegi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c830b326---relupadujim.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/40297438577.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/d7f412e95123fe0e16ba8d16c5538671/69009616006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+gta+5+iso+ppsspp+free+and+play+with+emulatorPDF 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_off0001f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9E3 20864 bytes
SHA-256: b8773e6ffc716beb362528a335e414b21da292b761a1cb45d84d1a3242508b5b
font_01_sfnt_off00023017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002482e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2482E 11380 bytes
SHA-256: cab89bcd96579dcd3380db8c6d0bb67389106f6433388e39aeb4adcb1fd1c0a8

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