Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a261968bb53382…

MALICIOUS

PDF

76.4 KB Created: 2021-06-30 22:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43bdb5518c19b4f7f29eaa0d7c02ddb3 SHA-1: 86b2bd0758b932f55d46e67a9cae0306b459b172 SHA-256: 57a261968bb53382805ce7ef6d14ff9f8c41d1104e54a854924005f4284a1e37
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://radmangroup-ye.com/rgfiles/file/kitepifimisuviz.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb10170cb4f---51473846011.pdf
    • https://gamasteel.net/userfiles/file/buwuba.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d3bf66c0a---gakuxujajugona.pdf
    • http://dearbornshs70reunion.com/clients/c/c6/c6cacd1d9512a3effe7244eb89d69e0e/File/39634282915.pdf
    • https://anukulagrotech.com/userfiles/file/tolajijedeberik.pdf
    • https://balajitutorial.com/admin/userfiles/file/40134066325.pdf
    • https://ferado.vn/userfiles/file/77371053479.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/mabf343u8np962nmslhgc9rij8/86601251412.pdf
    • http://www.moyekolodin.com/files/1155117212.pdf
    • https://bakotech.at/uploads/ckeditor/files/muvatumevukorevubuje.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4b87c279d---sojunuzutivezot.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab32df22b---77278407243.pdf
    • https://detectiveoffice.net/userfiles/file/weret.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf8de47344---fuvisawewovikubupirok.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2fa62070d---80694352411.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e6574e3b---naliluzagat.pdf
    • https://dascalita.ro/app/webroot/files/userfiles/files/35780732263.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/sidenevatorunu.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608af29998725---47046260262.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/mu8gt9espnitj6aprsufp7era1/bofirujinirifekosevuz.pdf
    • http://stauarchitetti.eu/userfiles/files/xarikopomonofobonex.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c158f1b853f---raxewalawoliril.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bc5pqn9ld07a2fao95dv1n8hsn/dovuzem.pdf
    • https://mercerapparelss.com/userfiles/files/61800460643.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=differentiation+of+pi
    • 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_off0000ca69.bin
383eccb51267724081caba6f27890bd1f76d6a98f0390501570a3932cd283d66
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA69 10140 bytes
font_01_sfnt_off0000e12c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE12C 16792 bytes
font_02_sfnt_off0000f93e.bin
0f79f22ee59fb7231a75599f6b42d33ce95a727ecf5f470f6a785ae5f401963b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 16660 bytes