Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb8d4429ca90c38…

MALICIOUS

PDF

135.3 KB Created: 2021-06-23 10:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 564040845ed53ed5ce16d6fd8fafeda8 SHA-1: 580de0b1ab3530e597a5a88c91512939be6304e0 SHA-256: 6eb8d4429ca90c38790fdfa5bcb033e841547d75c8ab9d67d6037de6226e9811
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=pdf+cutepdf+writer PDF link annotation
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16087367616522---pebinegubonobenavesakap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608728680b828---92055875308.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608574e9db411---62931912235.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/38179a66b781beebac9d25be75cded14/sokofedov.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/199f46e426d30df57e7342bbb428ff18/ribejonov.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/784483c99cf7283c7883da8def41da75/43399765752.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/3qr4ric38u3hlkij3jri3127g5/kedaxafereku.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/rowatiloje.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609438fb1a9b8---26583565710.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/69335286675.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0a3994540---38731081990.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/fotaxadusivonakilubozax.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef13f719981c61e13b0f16a7c362f95d/86028619392.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/82934768904.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607694497443c---49486274059.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/fonexuvanet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 71576 bytes
SHA-256: 6a2d4287eed3b879b1039ad66cabc0aae5bfb4bb12405bfdebe8fe85dc8cc4e2
font_01_sfnt_off0001c28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C28C 4824 bytes
SHA-256: 46818fe72a1e906ae6808fd0dd5aeb43b9ad5afa40d93cf68c40b56b3042435d
font_02_sfnt_off0001d31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D31D 11052 bytes
SHA-256: a673cce212cd6a8f08b0ab042b44e0d2029198fe04566afea0f8e3698776d1ab
font_03_sfnt_off0001f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8D9 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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