Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb14376892c00077…

MALICIOUS

PDF

72.0 KB Created: 2021-09-02 08:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c5f0dc285590d9b3725c2ca7f5f6931 SHA-1: 83ee697b1942be8a6d87350a91cb108ebedc89b5 SHA-256: eb14376892c00077ea7631f1c40ffe995cdb3643a072892940cc6e15c663ba0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics (compromised CMS upload, link farm) point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bj2gqa97r2538k7g090quejkj6/2439945558.pdf
    • http://conblocmanado.com/pics/file/590787497.pdf
    • http://romangruszecki.com/uploaded/file/63124248727.pdf
    • https://asthasupermarket.com/userfiles/file/65316977995.pdf
    • http://heatherjansch.com/ckfinder/userfiles/files/gesixuvedamibefurukene.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2429f44c459f04fb29addaf94a0f58db/79047191893.pdf
    • http://www.alfapilates.pl/upload/file/9417361510.pdf
    • https://locktactyuma.com/ckfinder/userfiles/files/pafoxux.pdf
    • https://koncnc.com/genelresimler/file/20865865199.pdf
    • https://bravo-hk.com/userfiles/file/begejudajenonizuvuxom.pdf
    • http://wildpflanzen-planung.de/file/70526469784.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7c880b8a9605a27a1324841ef5afd0c9/lebuwubulusixezulepipat.pdf
    • https://sgcaregiver.org/contents/files/56347453751.pdf
    • http://inventory-acepipe.com/images/uploads/files/32334567037.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/1588841380.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b661683939a---lukenifonadox.pdf
    • http://ascensionchina.com/userfiles/file/wexezudajodepuralu.pdf
    • https://aiwcecckolkata.org/FCKeditor/file/wupufowezipozijevanol.pdf
    • https://alate.org/admin/fckeditor/editorfile/34389637292.pdf
    • http://driscollandgibson.com/images/edit_images/file/50917110442.pdf
    • http://alemotta.com/resources/original/file/dabakuxuninipavaz.pdf
    • http://sl-light.ru/design/img/upload/file/48527286455.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d62bed41---57126423244.pdf
    • https://olterus.org/contents/files/15453211556.pdf
    • https://bandotrading.it/uploads/file/10321055704.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+man+who+thought+his+wife+was+a+hat+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b68b.bin
325f90b089deaf4d6f3628def867b6d2d31326c4d464295c4989b73c9d61073d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB68B 16524 bytes
font_01_sfnt_off0000e0e7.bin
1ebef3346ecbc855cf93ae05018d3ae6ae89b3c6f5c3bdb6aadd340b3fd59a1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 10948 bytes
font_02_sfnt_off0000f9f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 16792 bytes