Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac515a576269b40…

MALICIOUS

PDF

70.1 KB Created: 2021-09-01 08:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f9effb69e5dc2912697ee39796d1d59 SHA-1: 0628af80b127dea6194dcb33b112ca2c73371071 SHA-256: 3ac515a576269b40bb0b9f3ebe8ab1dcd375de7b1876ab9af8422497b932a9c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites and other PDF files, indicating it functions as a link farm. The presence of multiple links on disposable hosting and compromised CMS upload storage suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://murasakijr.com/uploads/files/gitobuf.pdf In PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609603305c52d---bafixupawoxatunujifatekog.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/mozili.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/f5090e469c1c5ee72c4ac5afb664da10/52413049243.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e14f6be2124---zudaje.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/zigor.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8e3haq5v3irft4ngig2gpdab80/saxitupeb.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-14/20210814020610571642.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b62721b6da2---12197945782.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccd6818c74---45272898178.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/b16737b3c840cda004f4ee194b8afcb5/68345396258.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2d976df60---zumimafiturotoxaj.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44147a9b7d---82622635586.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/074d2ddc54183bb7f2639fcb90eafa03/67156556602.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/54039583171.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/2718901581.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/80058129262.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/koxivofapivob.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/wijuvi.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/wamep.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bb6a18e5---depufesugewu.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/xudapal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=extract+srt+file+from+mkvPDF 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_off0000b2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD8 10636 bytes
SHA-256: fc6d182832348a99e727779b1e24a5b3507a965811a437f393aee9a79545fbaf
font_02_sfnt_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 15620 bytes
SHA-256: 115384cdce816a1dc74868a46e363e5554067e12d0342250699c97c45400ff8f

Open this report in the interactive analyzer, or submit your own file for analysis.