Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6599a6450b323e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 23:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0894c2d67412b2348b9dc26aa017050f SHA-1: b794ae60cca5cba78e28382f9d813757bd538a85 SHA-256: eb6599a6450b323e9a3194156194fb87bd40d3a9f1dda2ccbae5b86b2ae8ac4f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript stream is a primary indicator of malicious activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://allytemp.ru/uplcv?utm_term=chat+random+for+iphone PDF link annotation
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ca73cb9d0c5c8b1ba6663d0d93448fc2/diwaxovobogaduxodofema.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/111517094943.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/reguxasiware.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/tusojetafewul.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/53160362695.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/96530839294.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/63266795542.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/gosuronotijur.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/vupeziladejoxavagoxa.pdfIn PDF document text
    • http://aquatherm-graz.at/files/savituxedumur.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/sasirufimunofewedujaw.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/34990191139.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/jusijomelevovuvofarofo.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/7911815410.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e47135d01fd4b476e53ce556ac8b7b85/josositebowubar.pdfIn PDF document text
    • http://meskerjager.nl/media/files/11351843864.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/27110302626.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/12307256118.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/pelovojug.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/gibavinukikap.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1ac50ddbc329b3985da73ca200b89ee4/nidexu.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/wigijizowoberamosavamate.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/57612141321.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_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 10580 bytes
SHA-256: a535cbe4cd6ef2a9674b52f0b680c59aedab4d0c130b6e9a6ca55c954a854b0e
font_02_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 18328 bytes
SHA-256: 0b692ebcd7320b299c203226443a50178c3c71693e647f1c2b156c1b7149123f

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