Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e3fbaf737ae332…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 17:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23a5c61f632407b321999ccb726444c3 SHA-1: b7335b2ea82629016c8057382a0ee280db7b82bb SHA-256: d8e3fbaf737ae332c57a51fcef44e387f5c8445325bc4c78e83356ade5c8e506
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kusadasidentalclinic.com/img/userfiles/files/guvunuditubu.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607774f58524b---safudadudegurepufomem.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/sakebigozikogajataz.pdfIn PDF document text
    • http://sartor.ru/upload/files/fifejumu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/3qime45dd8bv357soqr721um31/vozekitidudufopit.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a42868f06b---lagitenobasabefefubiwi.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/893166fa3265578b8bd1aab7c2c706f6/29989081752.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/bovozozadijoduxuse.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/tua0lgam23kgh261vb0ktv6980/2632561632.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/64421751968.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/sikiwaweridiwo.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7cba2142a71aa5d506532155e9db4e08/10428630727.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/21790905924.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/k9kkpg50bnk84mf9le2co1aqk6/fitalefufebaker.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de8b6f0647---sopefamilamajorasadowo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/73f8ab4cf00c0219f655dba2ceb24796/viwatomidukosijifajoniw.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc4dcac4e3---27267772980.pdfIn PDF document text
    • http://ridendo.cz/files/file/wusuwigabidofefopaguworaf.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/15849818476.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/9659573428.pdfIn PDF document text
    • http://whatdwellswithin.com/file/kejemafizuvilakalewe.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/13641340251.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/8726917562.pdfIn PDF document text
    • http://freewest.at/28918409695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=2008%2B+solved+problems+in+electromagnetics+pdf+downloadPDF 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_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 11608 bytes
SHA-256: d3fdb07711a858a00a30f3601f53df12f81048695790b889299536cb8075eb83
font_02_sfnt_off00010a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A65 19308 bytes
SHA-256: 82d27394a92d80f17aad8c5c195345c6928c834fc7cefdd39af15d714cbd5e2d