Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6fede427c43013…

MALICIOUS

PDF

73.0 KB Created: 2021-09-02 08:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc832a9171101a1356d7718af38cd295 SHA-1: 3dc0b3a2b1d90210c11307033fb0c4d9680b8f9e SHA-256: 5f6fede427c43013ec704490c08bc52f7b16636f0a85c8a60c99fd327857135a
164 Risk Score

Malware Insights

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

The PDF document contains JavaScript that triggers external URI redirects, as indicated by the 'PDF_JAVASCRIPT' and 'PDF_URI' heuristics. Several of these redirects point to URLs hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://royalwedding.jp/images/blog//file/94971702762.pdf In PDF document text
    • https://vresponse.net/userfiles/file/12312837308.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/4470509951.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/7ec3e6c9cc9e5983ed574baaeadf73ac/fasizebapibasevakona.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075f460d4e43---zekesabevanugaxurimelufep.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/rotitopim.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/29074570394.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5922376bb21160059bef1790d53ba358/zarekuw.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082980f718ff---95026717610.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/saferi.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/mufekefamukubesin.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/nuwipevezolem.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/79692303732.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/73807760960.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/vimofumalovur.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/jagubelamat.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a11f70bf8ae8bc729f9e29e040ad1835/gonuzomax.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611408684406e---83572493016.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/65242598043.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/dizotol.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/xojumikevatululetumo.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/gafalinoxafog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=l+lucky+patcherPDF 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_off0000b580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB580 18784 bytes
SHA-256: 19b049e76f164ed4daa3141d2263c130f200edf2fb20643239ba2d7aaebcdf76
font_01_sfnt_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 10252 bytes
SHA-256: c694d534842050569f6b32629150e57e60678255f1f79a0ffa5be0966f2f470b
font_02_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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