Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a65a882ac823dc…

MALICIOUS

PDF

91.2 KB Created: 2021-06-29 08:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c04803bf3e7473063803125013f972a SHA-1: 200cf1ff79a2c8e4ccb3308718d8d33726f11ee0 SHA-256: 52a65a882ac823dcd28bbf5e22befa58fa1d29110f5fc8f0b5a8c63f0f04e786
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3abec920788a5a05fabf94d7eaaa4fc/36509409644.pdf In PDF document text
    • http://alt-1c.ru/userfiles/file/55975188562.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c98fa0d6fc---96243876312.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/sinebuwukunudufigo.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa82647a6f---levoxidalatama.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/2288732141.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/39969617692.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bffdb54de31---rinafomigenorupebu.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8fe37d07c94bbbf8aa77bedc9641cb6d/tozamem.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f44f57096---xiduzujiguzilonapudoket.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/vugowobomanezatelubi.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/32085978292.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6a2c8540413dba2a4ead638c8412cd1d/sumode.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7753f963---fizaguwis.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/qv04tjfukthlh1ivjg2abto2pa/29522703134.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/4jg05a2vs70en24iu27qtpdckv/62316611642.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608013088cfef---tawulabuvuzubafe.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/81c50cef4aaa1b06598d310493676eeb/lexoderoxug.pdfIn PDF document text
    • http://yuhongzg.com/d/files/10311246785.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/87074669893.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/93993080137.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/43936757950.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b548e3c32c6---40244310526.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/172453e69b0902fed42e8aa5227a4934/gixinekedilakegekurisifad.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/307c4a363d3a9eb6bc26674448fe19d1/8830152721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=excel+project+chartPDF 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_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 17248 bytes
SHA-256: e5b12ff65318d637c8dbba7869e724f5d4502e7f64788586ff1797b797bb4d6e
font_01_sfnt_off00013006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001481d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481D 10324 bytes
SHA-256: c094f5ea1350d7eed4cc79b158f28c731635907f2fe27ee285a3d7fe57418275

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