Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a99d34ec448af3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 10:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04ea85512861cfa423b823c43785a0d1 SHA-1: e8b84777c9e648db81f1980c3708bd618a7bc049 SHA-256: 78a99d34ec448af3a0c6b276a44b54e5ea42497803fdc06ae33384aedb271bc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, possibly exploiting vulnerabilities or social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://grandplaza.bg/uploads/assets/file/20269463041.pdf In PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/71370350639.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613248f15d9c2---29185116898.pdfIn PDF document text
    • http://actinq.nl/upload/file/koritavezafez.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50329581984.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/48273967836.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/timop.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f02d6104000ec23cc56ca26df5177fa5/dorumux.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/81849570334.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/palemonojozo.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/pukupuperabi.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/88873612470.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/jajopokulavenota.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/danuxilemimozupev.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367d3776409---zivinitijisal.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xikuvinawifafofafuwo.pdfIn PDF document text
    • http://fourfoods.com/images/files/96269668093.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/7ljl43qjkv50ie7ti6qqofnscu/saduvixatuzidotixures.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/fosevanavozutogaxamunej.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/luninowudigilap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wonder+woman+1984+on+streamingPDF 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_off0000d9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 18616 bytes
SHA-256: 491452088065e8e74119b1c49584fbd29d931bb5904bd4ec15244ca8425fdba0
font_01_sfnt_off00010ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE1 11128 bytes
SHA-256: 9093cce6e6018a2efc3d31adeb49dc07eb7eb5478d22356ebae208fd96ac33ec
font_02_sfnt_off000124d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1