Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8c482125a359c3…

MALICIOUS

PDF

87.7 KB Created: 2021-08-12 12:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f07dbc449af04cbd99ac4ee0ed296c8e SHA-1: 90f95fac24ced8ebe7c5def1909b805e1ea143af SHA-256: 2c8c482125a359c3489b7c153ad40c1bb752e0d1709484e7c7aeea607a46ee5f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, which is a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URL targets are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vishalahospitality.com/ckfinder/userfiles/files/70187105338.pdf In PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2039c411669bab41ce61efeceeb47581/vebafajubipupawanobuzoben.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/23fe0ea986f6c2cf4c7e35af9161a02b/75186549293.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c60e3682ba4---7505988709.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/pufawifaxamaso.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160719d5e6662b---kipazejixilafu.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087723a5da8f---kakadevibutasinaxe.pdfIn PDF document text
    • https://agermag.ro/mm/file/75148084136.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/vabasaribugokulolinef.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0cb8164bcb2af06f1cf36f21df75356e/bukibasigapox.pdfIn PDF document text
    • https://loctra.net/userfiles/file/dalew.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/lomulopumoporijuwi.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/gupanivokudejujojodotixam.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/47790058945.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/ravoke.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/kv6m57aukf5ci9m2hh1nf0k323/pilexovevan.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160964fa32f25f---70491327315.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/cc32fv1k7gqria95k5n6hdev9g/3041322828.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080562d86b5f---timukozobizex.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9fj1pr13fam2f96u182vo5b0cv/42365029031.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/5773415582.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/50315263299.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/kewivawijizubeti.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/janipobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=aristotle+rhetoric+summary+book+1PDF 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_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 17056 bytes
SHA-256: 7f97baed87441c0330814c4f062d76e76389f22cce50ef8e23dd0ed9f8930f6c
font_02_sfnt_off0001378e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378E 10868 bytes
SHA-256: b62934b12bbd94c70180ac0ba4ab9b1fcf9859d7361e9f17800bbcbb9188d767