Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efbd913aecc5464…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 22:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c3de20e87ced51dd35389597689fa8c0 SHA-1: 826ad6fe937d50b33a72b59c6c72a1e3c177dd28 SHA-256: 5efbd913aecc5464683d89e2ca7146109abb4b98723d34f0f7d89c83587a68b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the nature of the link farm and the detection names imply a potential for further malicious activity, such as downloading second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://karthikeyanjayaram.in/userfiles/file/70791727194.pdf In PDF document text
    • http://studiostocchi.eu/userfiles/files/66925357297.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/xawegupeganutironovoza.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/4791875916.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210903091212.pdfIn PDF document text
    • https://servicepapik.ro/files/sepomofomiwori.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/bozezoma.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161395e90d5ccf---ruxurebuwaminexeno.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ef021429838c219a184f1d1975c20a6f/nabuzasaxujowulotitulilu.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/fubawazalexo.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/48598646806.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/wozilubikurogaworabevi.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/32007431728.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/tazin.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/disejibalaliragesuki.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/lobefiz.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210913170358.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/tagafitaguregiretom.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/tunivikirage.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161399071317ab---xufasusorevug.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/71613284328.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/3682517331.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/43698912881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sketch+photo+editor+apkPDF 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_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 10460 bytes
SHA-256: 28da090e158ecc09f76a10d20b733fbfe07c5ca4e2059f378fa7949079d0f8d2
font_02_sfnt_off00010eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAA 17976 bytes
SHA-256: e82acfc01df61d323754b6d888c88a6444dc67802334ec19b47ec735750a4462

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