Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5cad1cbb8ac319…

MALICIOUS

PDF

102.3 KB Created: 2021-08-13 12:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d04be2078673c4a9591cdfe3082be309 SHA-1: c294f136f9e8fb1c249c3ac00b3204da9de41130 SHA-256: 3b5cad1cbb8ac319f347a111e3e9b9abdb9044f75d174a0cc130f43df83e92da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. These links likely serve to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://asirius.su/wp-content/plugins/super-forms/uploads/php/files/97fc33636927ec2d060071366ba86ffc/28307853551.pdf In PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/10c6a450ead4b6ec4571b209daf9ac4f/2366028126.pdfIn PDF document text
    • https://majubesar.org/contents//files/39400419813.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/futoloxofiwalu.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/66004396130.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/jexezunedowiperuzup.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/09dfb005e5df719b13e6010481eab41a/43257581687.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d7458bcf---66682614217.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/63c63e4149d2bc89eca1c48388505baa/viveverapoliranapigudaras.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/fakuwapetilojavuputule.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/fodezinaroninad.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/pusafopejawexebipeminujej.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/86313499229.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/benc9fh607rl01uh0ns8vakhg4/54957701135.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106b0098e6d0---77855364575.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/2266a207699cfe1da97351f85a8cd20e/52281010360.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/savidujipikotojivuz.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d3365c4ca---63165121575.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/4206782387.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/zenenitogixaxin.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/siwupuvitidokuzutakum.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/38088835379.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609442d61f681---zasidaxomekigasimesesepe.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/54506263731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=foss+magnetism+and+electricity+module+answer+keyPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6cad9f2109f98ffbb5ebc80b6ba11151/86684218773.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_off00012c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4B 17080 bytes
SHA-256: a6fd57ebcac61385e12c7b0ee6af008b42483c2c7516506d0f87023ccd4d3272
font_01_sfnt_off000158dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170F3 11084 bytes
SHA-256: 59c50aef7df7fc6e20828cd0ec4d5f3b4e9a7026089a49b794bdcdb550851519

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