Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b799f25cce83b13…

MALICIOUS

PDF

74.4 KB Created: 2021-09-03 02:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96a8cd528bf7a06a268a423a5370e98f SHA-1: 8d964c4709503619974bfe9e27c4b1942c0542a6 SHA-256: 5b799f25cce83b137406303f356ad8df0171e04c4d3d757eb0fc6f6ed6f94263
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. One URL uses a raw IP address, suggesting an attempt to obscure the final destination. The presence of these links indicates the PDF's primary function is to redirect users to external, potentially malicious, content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/24npnvburv008c7irvstrr26t6/56959328493.pdf In PDF document text
    • http://home-delighted.com/user_img/files/kibipanamoderapipavag.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a268da101e6---62425608386.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/pukopomomomabigipipiti.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1ppcoooh8iehagug0n2s83g052/37728040206.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/96545063755.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a341aaa5e14---zazivifesakad.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e41ee5366---jinajaxebu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/08f5d11549e7d4e55b910e8517c52948/wusudodagezopat.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/53943836711.pdfPDF link annotation
    • https://nikosdimos.gr/userfiles/file/1574452351.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0822a15c0494b602011439d44689b49a/40011357618.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/42665577003.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/safujudab.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a3428663004---sidowidelofunopalajewix.pdfIn PDF document text
    • http://kgmda.com/upload/files/97882091109.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7362541337ead42b60f8e72a518a9cc5/64264068466.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ffa53079085---tuvirujapamugomum.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/wenitezefo.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/savevumuvakupewegal.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/71692692902.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/67346629295.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/64941705810.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210626124506499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=metabolic+balance+diet+pdfPDF 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_off0000c282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA99 10476 bytes
SHA-256: 95adf570e6f1f069728a3fa1bfb12d422853f6da5ca3d4b8226c9693a0e3f3d8
font_02_sfnt_off0000f240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 16320 bytes
SHA-256: 13db2faa5e43a1b87b3af3107930295f42a7c83c9dde68667527030fd918ebcd

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