Malicious PDF — malware analysis report

Static analysis result for SHA-256 f611785fa03e5d46…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 22:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3dca58a0f65a603e21312960d51fbfce SHA-1: 36f1718ff5df69fb7456d454f54d159e4f6a41b3 SHA-256: f611785fa03e5d4625a6b949e24a45e791c679dc3f78448759b4aa2533f49d9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF format itself often leverage embedded JavaScript for redirection or exploitation.

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://infrive.ru/uplcv?utm_term=greenify+app+download PDF link annotation
    • https://iqmuseum.mn/uploads/files/70446323894.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/29448168419.pdfIn PDF document text
    • http://grupophi.es/uploads/files/51323907340.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/zadakelijogimuwifadinelu.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/76836332875.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/16368747258.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/rijak.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/10415776303.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/ralawibimar.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f157fb4039---72830359148.pdfIn PDF document text
    • http://yongqingtech.com/d/files/97569354746.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/19281694103.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/vofapuwixulepebul.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/33376328259.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/kitalezumapajuf.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/wefekawumomezi.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/60704438392.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161408cc16184e---21797665837.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/fodakobora.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/95112305819.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/a8374ao9dcql9toic20rtvp763/tonofinefolezosuxivez.pdfIn PDF document text
    • https://buka.ru/sadm_files/subamuzelodotik.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/fikaxujowizisijof.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/xazowozoxiwewalaz.pdfIn PDF document text
    • http://aimic.com/userfiles/file/94318508452.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_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 10464 bytes
SHA-256: 5830168830d76c7beaec14cd39c580f7369223966eba40a7e269eb1483610141
font_01_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 17084 bytes
SHA-256: 60fbcc2a8b2e130a333a339e689547279a7d01e3e8d3fbd3a6d75f9d786f6654
font_02_sfnt_off0001171f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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