Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e9937a5d3f1984…

MALICIOUS

PDF

75.1 KB Created: 2021-06-30 02:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48d0d5bea0c5b8fa1f46ba15926d2090 SHA-1: 5d70e1cc3a5e8032eb4cc1ddb3625db91fb50be6 SHA-256: 52e9937a5d3f198469155b4f00fca27ceb9aaa5da4e14e6d02c49018a4f4422d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, and heuristics indicate it is a payment redirection lure. The document contains numerous links to external PDF files hosted on various websites, many of which appear to be compromised or disposable hosting. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest it is designed to lead the user to malicious content, likely for phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b49887a1155---jarapomiwelofane.pdf In PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/21815715807.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210517030439231.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/684760270.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609257ef1fae5---85800328031.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/67094017853.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc00776fd0e---vogewasebowojomen.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d29ad96fa6f6d1e8348fdfaa3efce585/koxaleweresenapetekiva.pdfIn PDF document text
    • https://digireg.cn/upload/xovurinukolezelumeraj.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ff3fa97f9---pepameloxegula.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c8b5e309775dc234aed3f23d5053c03e/pavobukusufigamizubi.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/bejemozo.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/nokuzubuf.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/10c3e1d65cb01f0bf29d16b0b8edfe32/13656696675.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a124d2063---wojotijutelu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/pqua39bsk9j4p0ptbdb147vlq5/93332186255.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/moerqp6td4oim4er8uimsikeoa/kebasemodavasisif.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/16162234071.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/5pjpo7d7rtg1j8u73n994snhre/jokupaporu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ddc03ca35---xetesufajakimuvodilutuso.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/kefibadutixomixagosopis.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/22b90dc52a9752de07a5c46c9eef9dc5/62349233959.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/wineli.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d3ce23fca---93603023644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=just+pay+it+forwardPDF 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_off0000c75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75A 10500 bytes
SHA-256: c7feb4c116df83b02223626680e44c1c1a14d19bdea8da188322012bc0e0ab7c
font_01_sfnt_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 15536 bytes
SHA-256: 055d387ea904d3d5bc24c93ba0bd1441bece8b12b8ef7534d1b09db54aab484f

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