Malicious PDF — malware analysis report

Static analysis result for SHA-256 5649b70d2b953bf6…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 14:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a506880877215e2cd093b41b5ac29fce SHA-1: f686ba72a46ce29c9e611e5b0f284333f46e8fae SHA-256: 5649b70d2b953bf6c0746d565892e89ab70db71c5eb7a50101c23b612f421ff6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/433f0420849b5db875a22e97f93f58db/gibawujukusefogabe.pdf In PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/61506711926.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/gabanufixetanevosamiw.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/xepazimuvepip.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/92082687739.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161438e6413751---72317421269.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/16177978783.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/wavobiniputis.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/gilagiladij.pdfIn PDF document text
    • http://inphilong.com/upload/files/xaneginafalamane.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/pofidoxivuzonasagilamese.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e32317a863---zoxuzetelofifuvopezabuma.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/77976132620.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/22219107641.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/78309880668.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/kirexokubafot.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/wifuvimasabijekupukuxojo.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/45664875267.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210912074347.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/bidabosejaled.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1fc0cee31c68dcc95db27599dd293c32/57175368825.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/96579381442.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/rlu41ptl1de96f2frcfc176k34/lotavuvajodida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+app+for+presentationsPDF 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_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 17624 bytes
SHA-256: 590bc2283f999d5d968f84cd92d0787046f631585aa61dbd4052a6b971266d9b
font_01_sfnt_off00010ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 10428 bytes
SHA-256: 049d601ec53f810e55047130b1451095a3b5201911489c0781549ce37e943877
font_02_sfnt_off00012664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1