Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ff4811dfc15eab…

MALICIOUS

PDF

90.1 KB Created: 2021-09-20 04:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9ff23acd9150333b3e49712ce7988f1 SHA-1: f43c208c75333328deae971e82b8455ed79b0a1a SHA-256: f0ff4811dfc15eabe42f7ada729e4fea82ed9b6a44d6a027c5504d37322bd7be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to numerous external URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to obscure the final destination or distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://surestegc.org/documentos/file/vutajomososadizisesu.pdf In PDF document text
    • http://moscowprice.com/content/xuploadimages/file/92608357995.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/fagawifax.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/xojidaluwurazukabem.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/wenudowiselef.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/mopetatorezodizil.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109091902158285.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/veleravitorujow.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/4f754f2ebac5fa542811661fe61bb890/78809654888.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/42217967951.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/xumeduxuruxalavososilum.pdfIn PDF document text
    • https://renteci.com/imagens/file/91919939675.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/losifirakurepid.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/22454758835.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf1ddd57e---bigumapedejevafipe.pdfIn PDF document text
    • https://adikkedua.com/contents/files/2283098042.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/257e1cd8ecfb66330afabc57dbdf6fa0/4884281821.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210919053538.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/45095604442.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/miditeja.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/1600641418.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141165783eeb---vopak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+install+flexispy+on+androidPDF 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_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 10784 bytes
SHA-256: 29425b36ce69248b760d87981349d50b9ba70931ce4fe0b5df9333d653098e90
font_01_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 17640 bytes
SHA-256: a39a1a8347b904bd80766197846c2b1fe72ddfef46e2afb413b168e4ab04c6ad
font_02_sfnt_off00014275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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