Malicious PDF — malware analysis report

Static analysis result for SHA-256 927e3e6a03375fd9…

MALICIOUS

PDF

74.6 KB Created: 2021-07-03 01:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63a9e1c76e0a2503090b002f8de8430c SHA-1: 7fd8c5366b8216ef06eb75bba861cb4140125a8e SHA-256: 927e3e6a03375fd9e72c817c564dc7fb17a63ca8bc723cdbc02babc7633f3984
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0537058e61---veboxe.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/65256840447.pdf
    • http://efuturesthai.com/uploads/file/wisapezogapetabidi.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d3d605a14---padag.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078911db6298---rujibujum.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080215dbf6e0---xofuvemuloxoguteta.pdf
    • http://bagiez.com/userfiles/file/luferekavuxamudunufok.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a38a1f20c8---saniduvidegotekon.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c325eb1734---68025666220.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/tugapajoluwubole.pdf
    • http://arohitourandtravels.com/userfiles/file/jepelutotajozexukuneg.pdf
    • http://myjobcareer.net/userfiles/file/2021061603080573499.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/35274622176.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/46231764135.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839e9d34042---mozopomutojibobuteralab.pdf
    • http://ubest.ru/images/file/69683091952.pdf
    • http://amandamaitland.com/images/file/31471740578.pdf
    • https://hoangnhataudio.vn/media/files/90543770284.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160736a8b1eee8---bivejanemofuk.pdf
    • http://thaimassageboy.com/ckfinder/userfiles/files/67620002615.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/q7vq1v1qhd7bbfli93aghidogr/govil.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/287f673ec201664c1d9d34f356e5ca62/nipazekanofalesofusuj.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/1c1d43c8b664a28b75acadd04fdca2eb/19149459178.pdf
    • http://cioccolatogallucci.it/userfiles/file/jesibesawejuzelupu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cephalexin+wound+infection
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AE 16792 bytes
font_01_sfnt_off0000d9c5.bin
4ef876108565c5fdf7c87634facd6d660f2090984990abb17ebd0ff62360a528
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 10768 bytes
font_02_sfnt_off0000f296.bin
399dce07c194cf38ef0a70b269591203905c331d5aacce1a52ece003081664c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 16172 bytes