Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4ef8d38b7d87fa…

MALICIOUS

PDF

79.7 KB Created: 2021-09-01 00:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d837b8a5c29abd1d0d3da3b2a7574d94 SHA-1: 3574771759e90fc4a5863b41851bfc64329fc64c SHA-256: 1f4ef8d38b7d87faa32256199a77c37912e227d4522065421b596278e380c6e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=believe+tamil+meaning PDF link annotation
    • http://work4shop.cz/userfiles/file/87116771543.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c91beb697ba---16268881106.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/455e9e04654f7379cd56f5fa324cf71d/jesafu.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a9b9c15811bbaaa8943bcc41eba2a43f/nibanototisupapimeveji.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa8998b0ba---josolipezivedezipoz.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb6158c63d---jopagifepufebedosuxujus.pdfIn PDF document text
    • https://actorconseil.com/files/file/5248574176.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/82179444883.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/kefegujutatorujokateweza.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052718503673499.pdfIn PDF document text
    • http://championsview.net/userimages/dimefevizowedoxokizid.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/afee1fbf86710c2322a034086b43c576/72650521348.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/fojezazumajidu.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/25460365523.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/28050522575.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/36010309574.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/jivuribuderepinin.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/72469380509.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/00bd18e9be8952a6c21caee82ebb8d4a/moxinerepedojudawego.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2059017c---juwadikipijefifixabigari.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce763556daf---39385882554.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/zufitakuwamogitigerixek.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/fuxaletutolujofexi.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/24165397195.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/71448655972.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_off0000cc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 10184 bytes
SHA-256: 075d7afdfc22d295e17e3b714e1575761726456c23621f97e21f1efb64eb64ab
font_02_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 21776 bytes
SHA-256: 1ae2a7169f9699d2a7991edf7b480b4255da11cb2ad45400a000b900c6aad4fa

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