Malicious PDF — malware analysis report

Static analysis result for SHA-256 3136ff9b0468a331…

MALICIOUS

PDF

77.2 KB Created: 2021-08-29 07:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 021765779b141e22e055b8828ebfab34 SHA-1: e9323a267926248c0ea19313972df94833482297 SHA-256: 3136ff9b0468a331ffb7111988a799fd83ce37ad5299d3d5d26b2a08a299a210
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely part of this lure, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.verneteco.com/ckfinder/userfiles/files/66247420507.pdf In PDF document text
    • http://babamoleskine.com/files/file/56399971619.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/97370715585.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/46276316868.pdfIn PDF document text
    • https://nicosiacaffe.it/file/62353614072.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/pejugoxeba.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/bokatekagujo.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f39be0f2e47---puferugezotabunudeled.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/kakiporepupuf.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/derefodawebipuzokofikokej.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d7ae3c47f8fd9a04dd1dd9b444afde6/27541390321.pdfIn PDF document text
    • http://deauville.ru/files/file/31638402836.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/11606377776.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/6651938203.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/81697505046.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/geban.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/14919636332.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/vgfs72dggq2v74r7jtf5sq1h7e/ropupikizumako.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe92ad1e90---15459040732.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/64337f0b7023c090aa95f8ea38f83806/48635011003.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65b6355cd3---5823185442.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf535730e9---zosesasijonebalowofomamuw.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd2b7a21e5---45183850443.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/6938936f287ccdb97759807c9721a4e2/difekejizusisiliganida.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/fomolobajuvemixozij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=multiplication+of+decimals+by+10+100+and+1000PDF 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_off0000c883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC883 11200 bytes
SHA-256: f971b8da8428b60ea672878ace1a40ffe8676ec64e40b4cb8b29d357b4ebdd7e
font_01_sfnt_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 16956 bytes
SHA-256: 59b5a889ba8705cbf254cd82a6d088359739f482ae25d0dd25766879aef21b14
font_02_sfnt_off00010e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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