Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a5ab13e9c43cd9…

MALICIOUS

PDF

73.6 KB Created: 2021-09-01 12:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 71b79d63236853e8879252f6cae42255 SHA-1: eb5baae5b84981d0b27775bdcb8163479a3fd600 SHA-256: d5a5ab13e9c43cd9e5f7fa54b6f6b9ef8e97491299345dc59ee416f2d4e78a3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm used for distributing malicious content or phishing. The presence of embedded URLs and the ML_NYX_PDF_MALICIOUS heuristic strongly support a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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
  • 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://ukuleleceilidh.ca/clients/860383/File/risapuvuxagomo.pdf In PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/16186993657.pdfIn PDF document text
    • https://stopserv.ru/files/file/sosakigepapijivirunure.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b618efc7---75749457696.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/jileliza.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3b0a38f89db30ebaf255cc95dad80133/fukafuwakisifulilanu.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/34561876060.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/96840528194.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210612122429.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/58612cbab9c7b7302afc6e8a4fd45598/66709423248.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/5674033266.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fb41aeec7---53362714707.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/10893043731.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124ad19cf439---73335595733.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/latil.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161133ef77c479---tefusowepiv.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/fogiwosofazawajuvifok.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/24069576216.pdfIn PDF document text
    • http://www.celso.org/download/tugaxidodok.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/0e0c1e4ef02d5e9d0603f04cda396ba9/76698466830.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/gamivirexa.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/fed52e11160932252967ccaf3aad0174/lajalotepazedudojunawel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=honda+questions+and+answersPDF 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_off0000bf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF84 16168 bytes
SHA-256: 795cbf4b03bc1e081af42c8af10a1fbf738a158d8cc0ca3fbf44233a11635751
font_01_sfnt_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 10516 bytes
SHA-256: 76c586c10c9215ae7b5bc81e5240cc2f6fef1c72afb6151640c22f6855af7ea7
font_02_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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