Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ef6a657b09c73a…

MALICIOUS

PDF

87.3 KB Created: 2021-09-19 07:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 174888962aaed152414936508106f5c2 SHA-1: 5b186bb9baa422ec59979389d805cdee39246487 SHA-256: e1ef6a657b09c73a92dd26aeb8c2b1078f0e4dbde13d768b5362401524a126fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing a link farm hosted on compromised websites, aiming to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seghers.kr/data/editor/file/360755562612f8db980460.pdf In PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa9a6e6e1---mexix.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a7dc1311de7bd7bbce7164551fc3566c/84170312560.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/56929833721.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/jaxugoguniriwi.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/52587949714.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613693238b940---boraridejet.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/xanutaligolaj.pdfIn PDF document text
    • http://soles2walk.cz/data/file/dizegavuxowofewu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/149eb8da08c78fb75ca9ba109af945b7/vajivusirugezamebixogi.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/8683844458.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/vixikebomoreveguk.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/zegabogutiletazeguzaxe.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/neporugagobedavu.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/57729381798.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/jajavarujixelu.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/52554466882.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/pajoxipofuxemader.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/xoziwolutileteteladem.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/87036933050.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/watuxoruveb.pdfIn PDF document text
    • http://hybsch.it/upload/file/fuwarixisida.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210911075912_sryd4g.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/feligexemenerulamu.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/86973619545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=silver+dialer+apkPDF 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_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 18516 bytes
SHA-256: 2b0dd8419439783b59fc15702152f7ce5ce87d556f14d540267f78b1a0f0d76f
font_02_sfnt_off000138bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BB 10128 bytes
SHA-256: 7501234659b85caf5438fda370a5a27c67b7306335e4e8b588b71a4fe06b8e71

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