Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b210e200617348…

MALICIOUS

PDF

87.6 KB Created: 2021-08-05 15:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d66b329b501f4ca9bd5b4b38b9410940 SHA-1: 83245f2e038e8fe4be7df4cf5b6d11a361f3a19c SHA-256: 42b210e200617348b55cf913ada6c09b8715b003f6654bfe42b5857bd4edff10
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, a common technique for hosting malicious content or facilitating phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the link farm structure is sufficient evidence of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608697291fe4e---mamunuvo.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b4bdea508---medozuzi.pdf
    • http://angelcabrera.com/FCKfiles/file/59077600254.pdf
    • https://marblo.ph/app/webroot/img/files/kelademizutusajozegeler.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16104db6e11659---mavuviberozix.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3f547bc63---43077047866.pdf
    • http://aozbt.com/clients/3/33/335f642cf73e2ad82edc7dd4a76dad4e/File/vimixupotasirixijebuk.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f593c1bb8d---95743156723.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609407fe12fee---97350334575.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0f2e8ebf837da8fcac71cfd48d6347da/15789918127.pdf
    • http://hjtech.org/admin/upfile/file/62644286608.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c3a4f7268bcd128884988c95bc82170d/34271763834.pdf
    • http://crocepadrekolbe.it/userfiles/files/77691332327.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bc453953f---30956630406.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/db848ee9b4ac027581e9f81544a15b00/60966740414.pdf
    • https://cremyco.com/app/webroot/docs/file/69732189698.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606da48bd45a4---15040967792.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/utqtchdiotktpo0puqnc7pkutk/ruderuzinujanopus.pdf
    • http://animalscipublisher.com/files/upfiles/file/33612910795.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8f6b8d18a---dupatomojabumefatagidufew.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f118466c4d---73059063168.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160806587eb1ff---67828490492.pdf
    • https://parfumzone.ro/files/file/wawumabugolegarelar.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+answer+a+star+behavioral+interview+questions
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f324.bin
e12c9fba4d82c8aeccf87f29ee1e00c70b52a214223fb533ceb246dd78846652
pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 16952 bytes
font_01_sfnt_off00011f06.bin
65785b156886591a079726c47684b2ef956cd23d01b534b789e71b26b0f42e04
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F06 10988 bytes
font_02_sfnt_off0001384f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1384F 16792 bytes