Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be4042b9bf9797f…

MALICIOUS

PDF

83.8 KB Created: 2021-08-16 22:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 300fa0e043a47c0dd8aa449a97ffac54 SHA-1: ba5ded4e3b1815e50c43b68748635413ea84b302 SHA-256: 7be4042b9bf9797f6796a060e4dcf92f8f78f8c76bca878529384373e8edc16e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/uplcv?utm_term=cu%C3%A1les+son+las+partes+de+un+cuento PDF link annotation
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af82286f53f---47715034289.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/kinijexuzoruxup.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210701_5401A7AC2E9E4498.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/mirukop.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/68641299892.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16119999363035---69766191850.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/95415719685.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/98135545134.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/fawakipovud.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/xutekivu.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/54f74351c8d31de6c65e82e07307ed8e/kafuvopowedomalenegawe.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89619f381---67358181161.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/p3dcqgcal0nqhlk8i9idd4tnv2/vosumibeta.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1245bef4d7---karuwi.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea72cab29c---lewetogapuwo.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/d9e26fd3d786e6260505a065d12aeb35/42219637254.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/ziririxorifemalur.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/5lch1doiafp5tj6tim2scm8eh0/fesasevanitasazama.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/hqnj0reb2binluo8dokp0386g0/96427617890.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/13784411114.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1887b4d78c---tumosirexevubunekuruxo.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/govofulum.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_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 10728 bytes
SHA-256: 716501b6c5ee90da1c8e60b9bf9f8e131da0cdf8078afd83b5ef607a5165594d
font_02_sfnt_off0001138c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 17192 bytes
SHA-256: 41946292e5f966777cf44ec314e8ee4a5c16b5a6ac93db6b691557ef8aa07ef9

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