Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5bebaa406024e2…

MALICIOUS

PDF

93.2 KB Created: 2021-06-25 22:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17a42eb9e75c81362ecec535ce25a7d0 SHA-1: 85e632743fcf230f9d9da8d57e5399292ecab923 SHA-256: 4b5bebaa406024e2254fb904b34298b97401b0e740640ac200d8f21c13e1983e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=drop+dead+gorgeous+in+spanish
    • http://allamericannursing.com/userfiles/file/44207326727.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/e90c0c4facfbfaf5c54d6a946df3a831/66896448825.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f806bb5018---85198478521.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/12bea302744484393a310600b3fa7f98/fifamiziporagukegoxom.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/k3njq79amebunnn9ld620dpa1j/25389212180.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2f742c468---vogajup.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/vmjar9sn6d0cip00sru7jlihhn/vezerasovuwarut.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d620e7397ba---80412876519.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/1nccvp7d8cv2t7fv4lvstjdml0/juwijepozuneli.pdf
    • http://sobinco.cz/ckfinder/userfiles/files/3651328137.pdf
    • http://novichiha.ru/pic/file/pebisa.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16070685c27c37---norofotoku.pdf
    • https://amitadevnani.com/userfiles/file/30766166309.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/lda2dj7vjkk4ud12ish7pm3b41/kevupinusijako.pdf
    • http://ridendo.cz/files/file/zufuvonekudazi.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7abd6d0301---gavefinuzeseni.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1f94ec84---jumukojuno.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/kokosuvebiwoxiguximinusiz.pdf
    • http://servmed.net/userfiles/file/zenodisunozuk.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec10.bin
c2071aba6839a394ffb5ab6eefcb4567e9120daef7595931e53fb831f7da4dd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 17164 bytes
font_01_sfnt_off00010570.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 16792 bytes
font_02_sfnt_off00011d87.bin
16577dd2ba7ba3b3ae5da54758f19180d6d4192b5f9c88614e01c2f1b505788e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 10628 bytes
font_03_sfnt_off00013573.bin
25cf6db1f2410b6b37c8328e5d8045c39ee94332211c8ff87edeecd84a95ca69
pdf-font-stream PDF embedded font (sfnt) at offset 0x13573 19276 bytes