Malicious PDF — malware analysis report

Static analysis result for SHA-256 00dae7303cbf5851…

MALICIOUS

PDF

87.5 KB Created: 2021-09-15 16:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 91cf79022861156f547d80bd814e0269 SHA-1: dd46627b67e4a6b6b996853851b2b70de7bc8ad7 SHA-256: 00dae7303cbf5851cc987e0619dff0d36e1390c6f0aa9f5d3e95b9ad682e064f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infinity-pro.ru/userfiles/file/91234029286.pdf In PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/sofitigiduvuzabexot.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/95236538219.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161383d453d618---76680197139.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/zarizurevepexivijako.pdfIn PDF document text
    • https://securitydm.com/slicice/file/jusivalaf.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/04/kipumulij.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/50529434119.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f287e37963---foxubomikex.pdfIn PDF document text
    • http://packturf.fr/files/zofatiganu.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/52020296121.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/tudazomafowoluson.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/viperibezojuzemesis.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613c311342d55---76412276824.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dk96vuh60j8dpqdchq5nh2msm1/pobotevena.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7c4abfd5---mavijexuzufilur.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/silenipetuvepaki.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/gopewutukofolavivun.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/kinitajifo.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/46374179169.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134d87602d0d---bevadulogetofe.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/97788957067.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/26685234170.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/riber.pdfIn PDF document text
    • http://licausi.it/userfiles/files/zuboruwobufusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=idm+download+2020+with+crack+full+versionPDF 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_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 11276 bytes
SHA-256: ee25d5027435e9fb5212e1bac879e6f84b1705f80dd67b41352c33371252662b
font_02_sfnt_off000121ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 17848 bytes
SHA-256: 52c375f2c7c0100778ace15e1010d0de8dd219a1604d54d04060429e0ac16f45

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