Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f46a831d8ba6bb…

MALICIOUS

PDF

79.5 KB Created: 2021-09-09 04:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ccf4ffb30e58c090e4419d95f2e8eaca SHA-1: 0cce9eba3d8171e2c71aaafebda29c4add1c2a5c SHA-256: 41f46a831d8ba6bb349e6aba46accdecdb72b6aa22ff52c94940d18fc291ff7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and is identified as a link farm pointing to potentially compromised or disposable hosting. The heuristics indicate it's designed to redirect users to external URLs, likely for malicious purposes such as phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://noithatmfc.com/media/ftp/file/netulasezeje.pdf In PDF document text
    • http://isleford.com/filespath/files/20210902103304.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/99e73fda59033d496a3b6d4028b70a68/97014253761.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/42162330701.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1cec25b367a323cae4fabee5de828c36/zapewot.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/69899316671.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/74638935718.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/matotewezege.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/dagirazujo.pdfIn PDF document text
    • https://digireg.pl/upload/jerel.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/8498938158.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/dezov.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/rudesagegolixuzixojaxedep.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/lorug.pdfIn PDF document text
    • http://surausa.com/uploads/files/tanokatorokomani.pdfIn PDF document text
    • https://inks.bg/userfiles/file/zakoziwoguvaxosetaxeru.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/88747136754.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/78232520500.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/53959639208.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/zozubomutisokinenu.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/76820115199.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/29423952039.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5a714cba---wilisibexodejowovugijirit.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/9195241168.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/68816038797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=code+gift+card+generatorPDF 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_off0000d238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 10468 bytes
SHA-256: 97489f755e4d44b44e5ce94d9eeea47e474ad96234c608e6c1bf53d677e80c1c
font_01_sfnt_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 17792 bytes
SHA-256: dcda6eafe34130951e16a5dad0a2d50037021cb0cf19317f9c6f39520f96e726
font_02_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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