Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4ba31ec9818562…

MALICIOUS

PDF

99.0 KB Created: 2021-09-02 18:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a53da2599ca33a6b2b588b86d3a2df0a SHA-1: 4128596a56e358bd44cf2c8d8206975ca4109b50 SHA-256: 8d4ba31ec9818562d4e82a18de4fae50d1bf1231ccd56089dd1b5f88e1b4315b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF_URI heuristics indicates a link farm designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/ladakofuwegazovelap.pdf In PDF document text
    • http://honeystraw.com/uploadfiles/file/revari.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/lupuwuri.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1b9b81be9aec5462be168a926600158/73399572648.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d72543649c---71764456850.pdfIn PDF document text
    • http://charivne.info/images/file/jagosuwu.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/ac811ba53a8b2a94f25a77f55dee4694/gubagewujukonumaxukud.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/46670076055.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tiu659mm22agip7bdan7uha0om/gupiwepuzuvepozewuzotituv.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/76492657798.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/jedunawopikajofedege.pdfIn PDF document text
    • https://razredna-nastava.net/files/65821127152.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/93670690996.pdfIn PDF document text
    • https://belloverde.net/emailer/file/tabefiwerut.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/jomisunupakofep.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae420ab04---33308112068.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/77370147191.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/3823356216.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/1faae0944a7f8b9476ed0f5b512a7e50/28622576921.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/38642905639.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4eacec4ac---75582320569.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/gimilanunine.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01d7fb9636---73816217813.pdfPDF link annotation
    • http://forglory.cz/ckfinder/userfiles/files/85762643912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=john+kiriamiti+books+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/60457779827.pdfIn PDF document text
    • 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_off00011c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6E 10808 bytes
SHA-256: 485fba0d05b00389d590adc0581b5131ae04917ed4bc070e831d213b8c2e4a1f
font_01_sfnt_off000134ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EC 18880 bytes
SHA-256: 782af5017c3a813210e7ca07d0d6b8c92118b068732b1810319e1fc2ae9cc3fa
font_02_sfnt_off0001662a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1662A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1