Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df9de37d4284b59…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 05:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38206f522abb9d3d122dcaca639a6f9e SHA-1: 560f2dfb84e69f4ea9137d2dbdae1a297daa42ae SHA-256: 9df9de37d4284b5994cc8f452d0bcf3cd40a264b4672e7ffe73d2d7ec229654d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL distribution are characteristic of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://asia-test.informacittadino.net/media/files/11666688559.pdf In PDF document text
    • http://blgjad.com/upload/files/32981032303.pdfIn PDF document text
    • https://tessuno.com/upload/files/6137dbd111cd2.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/fokiladavo.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/95526861583.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/7575130804.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c432f5547d---winukiludesoxegulibiwokib.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/01/76694458307.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cdae6a0f8---kalan.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210912_F365D441266B9DA3.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161339bb417c51---xoguso.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137195e31a75---81657409504.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/zovonixuzakukegudolakutuk.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/xorikur.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/gre6a9lkli557em3a3f55jtke6/tajewitukik.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/59775832145.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/mazidajugaxajamososiwo.pdfIn PDF document text
    • https://renewone.de/files/kumoredukekitut.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/5453057490.pdfIn PDF document text
    • http://ranch.pl/files/file/zetira.pdfIn PDF document text
    • http://elitvorota.ru/f/file/79375440335.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/biruzusilavifuf.pdfIn PDF document text
    • http://elpijisystem.com/file/xugepisodemokasesij.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/razovelelekogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=clouds+2020+123moviesPDF 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_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 17976 bytes
SHA-256: 0f37fb98e3c8cd9f8a2d9f2638b7a22dac4822a18fbb35225e0cbaa6d5fa94ef
font_01_sfnt_off00010e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12666 10608 bytes
SHA-256: 6adb7e3a2cde48eb6879da70879ab3b11d0a48d6d0433d976d0db42ab0f4a1c3

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