Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0af790ee335642b…

MALICIOUS

PDF

102.2 KB Created: 2021-06-26 00:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47170f259d5deca7e2041b25aa21f646 SHA-1: 58dbac242544a62731527b27d86b9afef6647163 SHA-256: b0af790ee335642b4f289ed34086ad58d17ecbf3aeba3e47c2f0982e9e312c5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • 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.
  • 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://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/u9r92brkl6efsv91hpe5mi0ad8/83721707104.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d06a6ce8---58115713517.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/7bfe1ae8f075e971c4a2774622d021c9/73009531992.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aae22e2e526---68249921658.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/53939791372.pdf
    • https://jdlpartnerss.com/userfiles/file/muvex.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ebbfaa78c23c1b8bf2c0734ac8a76865/gavijozifupajamadexilir.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160af5112c19cc---32707310813.pdf
    • https://epiphanych.com/images/file/56254857232.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/835d1aa6b96b7235cd57c6a2f595f6f8/7150577075.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/20359531732.pdf
    • http://goref.ru/files/file/89227108867.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1d730a9e2---73236477373.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0ad0c3787---70546729234.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160763eda2bdec---95823909588.pdf
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/korife.pdf
    • http://blatt-gruen.ch/files/dovuvo.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160805f6af23ff---22071502277.pdf
    • https://cahayaapi1.com/contents//files/41019058527.pdf
    • http://shinies.ru/img/lib/file/gijev.pdf
    • http://amadpich.com/userfiles/file/dubegamip.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc36e47107---85899324044.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c3ab59897ff90fdf0be6e6304af6294e/45154409688.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29e08d0f7a---49973398551.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=use+of+grep+in+linux
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012cd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD8 16792 bytes
font_01_sfnt_off000144ea.bin
66053be3948e44afc25462b42a5e2fd0fc4800aa4a71a64c4dd0175e7d36db1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x144EA 17716 bytes
font_02_sfnt_off000173c7.bin
7aa43f747d4e862e95254903a24b0f98b26d31f096d01a071000bef882ab8bd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x173C7 10480 bytes