Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e23c08e3215b077…

MALICIOUS

PDF

95.5 KB Created: 2021-06-27 12:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d67660fba249a17730c6507f811a46aa SHA-1: ac5e68874c6ca08d6a36f95efd8e23be3fd648c1 SHA-256: 5e23c08e3215b07766e95cdea2e943ab86d8b21fcce9ac7fe67a45ab901c37b1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or providing credentials. The numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or link farms, further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://files.ibiza-ferien.de/file/fuguwumaki.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-17/20210517004756878975.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/zakulivonupirajivemelazat.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/87ed0b97e1b9eabb3af626d5c3dd112d/67021840542.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/df38ad4ffcaef96c92bdeb619c220aac/70063595609.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f115cb70957f9b77163c3ab0853c6c11/68332996935.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/9548712742.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/5bt173a8jhacao1rmuufvsbrn6/tigujupemizogog.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adde87858f4---23222650283.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1cbf5752e---99934687067.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/34aef565a23808a3ab7ef15e79cb067e/tajesozusejolidipufawege.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826594ab64c---46700302927.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/penurepefefanekegus.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a900f76a---17144110671.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a9eb6b62f221e4a55c188379366cdf14/67968692744.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/rebepip.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/pafov.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/rekamewawolig.pdfIn PDF document text
    • http://yejida.com/userfiles/file/2297602073.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/97006183362.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160814b97627e3---67650241567.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160723a643f9d9---87048025921.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/rekogat.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/56009341895.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1cmda04g69aldlaqm18clsine/witux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+find+excel+spreadsheet+not+savedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 1736 bytes
SHA-256: a970dc50f3fc642965faeb3d6f2817be39c8fee70eb220fb851f6e1b0fd382ad
font_01_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 10964 bytes
SHA-256: 74a7b7a184dbf55d3c1a79e0c1d2de101b7d0fd4d4dd63c0b07446432f72d196
font_02_sfnt_off00012963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14175 17652 bytes
SHA-256: bcfebb774b09a93a1ddc57b5c8aee612a229084d0813e5a1f49c2eddaf1c5d59

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