Malicious PDF — malware analysis report

Static analysis result for SHA-256 5462eac00487042b…

MALICIOUS

PDF

88.4 KB Created: 2021-09-21 11:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb0b30383aa2d371df9fa5646e1d3fe8 SHA-1: a0b7dfc4e498d74e5078882a2b438a15a4284b2a SHA-256: 5462eac00487042b97a7389a1378a03b29bacefff166674d675c63c0a95c5c63
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves luring users to external sites via a phishing-like document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mtt-association.fr/upload/file/71784786105.pdf In PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/benitiwatuxujixuwo.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/rovuvaxonuwesopes.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/19268529593.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161408fc518027---6166873901.pdfIn PDF document text
    • http://elma1.ru/!upload/files/futozefovejukowosel.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/wurusebonetuk.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/45910641444.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/46607751713.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139dfdcb6900---90470405811.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/binupixovumivuvosarosaw.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/nozipure.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/74702500792.pdfIn PDF document text
    • http://mayjack.com/upload/files/gumetavobenewadodoxajax.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/71972597803.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/202522b9d24e7c8cd851cb79344ddc9a/78054048571.pdfIn PDF document text
    • http://eventechsite.com/files/files/62525955610.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/kibajovug.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaeea355bb---siguzatufupi.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/23875929682.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/41052689467.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/bowodubimosizi.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/lozudakorokufiliguno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=why+does+my+android+phone+keep+kicking+me+out+of+appsPDF 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_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 11320 bytes
SHA-256: 75adb651e76ef7fdf16a3820b1fe3784c0aebab11456c4c7c00a31eee864762a
font_01_sfnt_off00010c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C68 17844 bytes
SHA-256: 8eaaa84623ea609c2e9d886bc5ed8886724f2223cc70be89a4806e2a6e4389e0
font_02_sfnt_off00013b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1