Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3afe52b3f0c646…

MALICIOUS

PDF

86.3 KB Created: 2021-09-04 09:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9837843cc5c861b60136b93d1dbb6055 SHA-1: 75a316f89a1dc3dbd7f5df408ee91b334029dbc1 SHA-256: ce3afe52b3f0c646e43ccd84feeea249d8bac5d646baa922ea22dff4609364ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, directing users to various domains, some of which are hosted on compromised CMS platforms. The primary function appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://csc0731.com/userfiles/file/20210625041510_mo10p4.pdf In PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/surilesekawawenumatuze.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081de386facd---bulitomuxonowipukejigewip.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/popupogifodeva.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/zufijanabu.pdfIn PDF document text
    • https://kaisar168.com/contents//files/2321756448.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/93871789935.pdfIn PDF document text
    • https://tepihtrava.rs//files/21301029009.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/kijigewur.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb9055eca2---70654165709.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d2fc38a1e0d21da20ee0b156ae796351/musavifixo.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/29483379911.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/89937108754.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/81472768894.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/mufev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=astral+projection+guide+pdfPDF 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_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 11004 bytes
SHA-256: a22e5b37f2aaa57a5408868aae24125b40559f6bfd90a5aea575a691bef08d70
font_02_sfnt_off00011aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 18804 bytes
SHA-256: cf415e2e1424d314ef6ed213b4da56c350cd38cea165a221d856643fb6e84816

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