Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36d025449a64582…

MALICIOUS

PDF

78.9 KB Created: 2021-09-22 19:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df748f73e403466afcfce7d9a76547c1 SHA-1: fc5b1c489b18fcfbda52a9442cc318b66a7d137c SHA-256: c36d025449a64582323fe747b2e0f44bff93087f8ab1f7a3d57a8108da5fc1f6
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://krisoc.ru/uplcv?utm_term=naa+peru+surya+full+movie+online+watch+movierulz PDF link annotation
    • http://dinskayarealty.ru/media/file/95890276912.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f83df3f74a---xugolodijuloma.pdfIn PDF document text
    • https://questyme.com/userfiles/file/gubawa.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/purozatosi.pdfIn PDF document text
    • http://edeins.com/userfiles/file/zovutologalixedivozesun.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/gasulegejatomaki.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/bedexoxusunupofiw.pdfIn PDF document text
    • https://maviet.vn/upload/files/lunopegemofof.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/53620740107.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/bufafugopitufunotijejinu.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/496282896.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/lifowevekekus.pdfIn PDF document text
    • http://podushka.by/files/files/48221358821.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b651f5e1bc---44155314699.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/dazazimawog.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd6c556a73---22301802111.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/82053422003.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/mewijo.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/6a442b4bf96cd7fb1ffcbd9ceef3579a/89813285561.pdfIn PDF document text
    • http://elitacasa.it/images/file/57886104171.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b2cb6f462824c08d1d73f45eb595389b/dejubimazemixak.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/vixoxefesagevom.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/33360411453.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140696364d91---32371749587.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/zironojurenoxeluxa.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_off0000ce67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE67 17424 bytes
SHA-256: 003b872b0c35122d23835e5fb74463c4717fac1aa6dfaa7a968efd2295be8c31
font_01_sfnt_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 11148 bytes
SHA-256: 2301b07d6eac3f05d0e0e860290bb589dfa399ff3c9065b8e3c6f6088ffb1b74
font_02_sfnt_off0001156e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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