Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cdeca0f51535fc…

MALICIOUS

PDF

78.4 KB Created: 2021-06-30 05:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b7daa72d36a608ae42ab6296df1fe0a SHA-1: c3c56966db596fd1b1f1a68547dbab09cef1a7ff SHA-256: 97cdeca0f51535fc6d1d5595119f4f839d287349e5b5eb56f7f548be9d72ed5b
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 WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to redirect users to further malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1ae58a521---guperonolar.pdf
    • http://cuatro-pr.org/sites/default/files/file/97977889409.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160bb744dd154c---wukixesizemotitet.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805acce209b---41461122458.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a79cc0aeb0f---pimarakudipogofun.pdf
    • http://dvarenda.ru/upload/file/xapiviratinuzevan.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9e978e32f0b8b63b7f4698dae9d19382/joxipegarul.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/877082501.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/506830fc7f912bba7dbe217037d252d0/15578897685.pdf
    • http://ridendo.cz/files/file/femonasesox.pdf
    • https://299-45.com/CKEdit/upload/files/4919435801.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/096c9769a41ff066157c52f89fe30840/32376116782.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7479165346---25785307898.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06d82176eb1dc73459cab730a41e79a7/vusul.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609894de023f8---xixififonibos.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608231ae06f80---82719004528.pdf
    • http://year-c.com/upload_fck/file/2021-6-5/20210605032553763164.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097735d8bd06---58102520493.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160864f497863d---69372716887.pdf
    • https://abofahed.com/userfiles/file/37382147213.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/08guhsmoruplfg1fejffhe4bbv/rusavijunuribemibivujewo.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ef40be96b6743e19c8e3cb95308b6593/vetolosefamisatosadisegir.pdf
    • http://tscyw.net/userfiles/file/20210610121821_tnxkg2.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=save+pdf+in+ms+office+2007
    • 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_off0000cc63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC63 16792 bytes
font_01_sfnt_off0000e47a.bin
69ba628932308f37d7ae9e7d696afb2bfb16a8ed627bb1a1db0253fd0f469a3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 10972 bytes
font_02_sfnt_off0000fdf4.bin
98b391e37876f955e39f8abe95559e6deb06a946601d214ff3413240081f5999
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 17676 bytes