Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ed77059cea174b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 02:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c7b14deb97a627b4fdfe728393e5f44c SHA-1: 03c9fc9ad5b921de205640fae08ffd0adcc15ff0 SHA-256: 41ed77059cea174b94b045c12e6bb94dd2c146b910492f35f9127dbffb65079c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, indicating a phishing or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/98dbd4fd93d3d157ffc4e80d47722c60/vufuvinuxakomanaja.pdf In PDF document text
    • https://ms2oke.com/contents/files/worujuvoluvitetexuk.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/24009403612.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/burabibegoxipofemusewero.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307345f115c---sapigikadiwum.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/57739854493.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/14579459346.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/55421424337.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/disusubezed.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/negegikofokuzugimexebeto.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210912200037.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/94580082298.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7235e3f7f3907413c8bd5140e1f44ef7/fewenewoxipuxininulara.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109010719498227.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/tozematufomosuguvitif.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/xupazogadegevelufo.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/33879484493.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/7276173743.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b6b26eaab08acfb0772ba666d33525ed/sofunewize.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8f0635ea---53483388046.pdfIn PDF document text
    • http://www.bash.cl/media/file/dasizuselariniselopun.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/45835388042.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/dufitagimonino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=watch+as+luck+would+have+it+onlinePDF link annotation
    • https://easyown.ddproperty.com/datas/files/72547968412.pdfIn PDF document text
    • 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_off0000dbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 10704 bytes
SHA-256: 7ef8d858b3c605ec15157248a42e98afd1bfdc996ec27ebb16d17689b1d5856c
font_02_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 17844 bytes
SHA-256: d560cb3b654862eb55311efcb19cebbbebd66b37bb5c4d57839590a408ec25b5

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