Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfcab5c75acbfb8…

MALICIOUS

PDF

80.5 KB Created: 2021-08-09 14:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18494515a29d040870e0326c5f71a9c0 SHA-1: 2f599aae3cd17a2d8eeb4a6ef59b4ea4e65afb12 SHA-256: ddfcab5c75acbfb8095f15159536176d31d623f731a1217fd5b3bd50409987df
164 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, with several links pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL findings suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://autohausnschmidt.de/userfiles/file/tidokitad.pdf In PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210624_E98CD4CC646683C5.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/mepegid.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/35156821433.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088564842cde---43562272612.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/43487450521.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/8569a74c3d74c0dc08d6d3d02d0261b3/xagudibujufipajuvu.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/10d739ff38bf3cb9a02461db5a11000d/najusorutepe.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/70158989751.pdfIn PDF document text
    • https://ikima.fr/uploads/file/tusifanexelepages.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a00f3404837657e68655ba1c62dbf198/19590628724.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df209786dff---73970018503.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/nowijowafiretupu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/031511231256.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bfad721aeb552b6d1efc8034b0b8f7b7/tolibuvurirujasi.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/92408147829.pdfIn PDF document text
    • http://unibox.lv/files/text/todomatoz.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/robujezim.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/relowimizuj.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b562997f421---58898265133.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/ziminamemojijutodozumaj.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/perefazemipojus.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff5019b9f82---31958088703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dragon+ball+z+budokai+tenkaichi+3+ps2+iso+itaPDF 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_off0000cf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 11476 bytes
SHA-256: 0f8dcf4dcee203305207b6e5405442c0e50e97d97a2addaeb866fe6218f72bf0
font_02_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 18748 bytes
SHA-256: a030a76848a4a7f061c495241d68a81c3a9093ca93a5f0f3d9d85a5bee39b52c