Malicious PDF — malware analysis report

Static analysis result for SHA-256 398919b4bf72f388…

MALICIOUS

PDF

87.6 KB Created: 2021-07-16 18:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 78589dc26148bf39f0ffadc6c85d8722 SHA-1: e3ed1818e72b3e9e158cd2500e4f9d4250bdfa8b SHA-256: 398919b4bf72f388d6decdb1648b30352b68fa48a77dc621b98e7c27e6a0ad44
212 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links, including one to an algorithmically-generated URL, suggesting it is designed to download and execute further payloads or redirect users to malicious sites. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/kria8ko7i7q76tmsn0cbbmqvs1/vudopa.pdf In PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/43851ac4b675a0870bb804a6a4f08310/supuligusosujiteli.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-26/images/files/vijetebotulup.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/febediwolelikarurowibe.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/giditawepazadiwatolu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607db8eba88bc---weginativigupu.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/jaregifizixebesilikikiniz.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/dujem.pdfIn PDF document text
    • https://unosms.us/userfiles/file/54809158524.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fc1e26837---10465438831.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8d57f3973---giketevatubazomafapedoxub.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/gemejaji.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/37968f7aaa56f57c645280f247eb4654/fifuvibiwobipidezozegun.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/998695942.pdfIn PDF document text
    • https://bataretak.com/img/files/file/pixivonevosizajufoniw.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/juwifewus.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/sejis.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f433258206---45698653192.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/9gm9honadpr76qtvtjreop4tpc/pivegiberojexobonowif.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/77344475977.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/durajopisivalidobevosol.pdfIn PDF document text
    • http://wenxuezj.com/images/File/zewoxelozivepixejataxev.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/42057219045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cuphead+game+pc+downloadPDF 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_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 10720 bytes
SHA-256: 6e9d682e5638ea89e7ac1ca3c11a47e2de8fb43bcde085e0a053092e8d6824d6
font_01_sfnt_off00010c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2D 17388 bytes
SHA-256: a699a2f9870270223e1dc5299a332262dd595f6635bf90c1ba38937048fd96ee
font_02_sfnt_off0001395f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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