Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a783f8bdb888d6…

MALICIOUS

PDF

158.1 KB Created: 2021-07-15 15:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5305db6e97272949fe9051be35252067 SHA-1: fe08e41fb8219e60df14584c25d1675dcb33fe90 SHA-256: 28a783f8bdb888d60406962e0e4f3849eabfcd4615635269676ee4c72d75e182
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/uhajoqmrae30ve5oeqm71oaio9/55419744900.pdf In PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/82705528260b51ccb20648.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607393b6a578e---43553991314.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/f8a7e7955cf87b489b14e9f71991a71b/dasasenawokexobotusuvoda.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/zotigololaderobasipepi.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837f308503c---jarew.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/mafebot.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f3a166a71f4e643d8e1c1107bfe505e3/48365611412.pdfIn PDF document text
    • https://kawanmto.net/contents//files/dokawexirupolaxigabawore.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b6243ac103c---17743330073.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/79805190180.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/jinuvf1ep84lv76horuf9vu4fa/50370613586.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade7e90e11e---nunojitat.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4b9860f928ae33388c2521cd1d666a42/xuson.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/50923009772.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/fotox.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/79ecfdbef442157caa254ee89ad18568/sodisexepidinarazapoxefo.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/digudokowat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=in+my+own+way+alan+watts+pdf+downloadPDF 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_off00020234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20234 10484 bytes
SHA-256: e8562b9f38e38335477ce08e604256c53d2f84ae300a82e959d29b6eaf36e3df
font_01_sfnt_off00021a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A16 23516 bytes
SHA-256: 0872fa436f7033a2ac5dfb8f83e973a685abf3a4eae65ebbb5dc6d5832db5b3b
font_02_sfnt_off00025184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1