Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f91f2bc091f970…

MALICIOUS

PDF

80.9 KB Created: 2021-09-10 20:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa4e56cfaa6f76665135dde9a24217d9 SHA-1: 49f9a7f6cb395e8d737a797887aa6fa17e8af59a SHA-256: 99f91f2bc091f97045d035f249da53be74e521b1891451eff7d358cc4f986e93
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a URL with a 'utm_term' parameter related to 'call recorder apk download' indicates a lure for users seeking specific software. The ClamAV detection and ML classifier further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=rmc+call+recorder+apk+download PDF link annotation
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3a40db315---43038665959.pdfIn PDF document text
    • http://aimic.com/userfiles/file/85155963056.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210909_9599CDA919EE1B50.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/38404433105.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/28876348481.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210909200216121865cu5z455a3zy6.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/5998754865.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/litinigumasibodojum.pdfIn PDF document text
    • https://sim2007.com/files/83231389036.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/75194477066.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/60144904101.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/koxekezi.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/niwerajokejozanifesatutoz.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/85722729292.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/38395890502.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/90248856827.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/gesupanebamasejiterex.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/nezaz.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135c6e1b4b47---58956921380.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/93661285030.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8c2d3d402---39184771467.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210902_131200.pdfPDF 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_off0000d6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 18052 bytes
SHA-256: 02f79d74495803ae358daf3c3bd5985582e404419434adcf72afb5fccae967a9
font_02_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 10540 bytes
SHA-256: 1afd326e315e5f395733875804b97051d6a3d76a2e02f6ae1720be577f451b09

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