Malicious PDF — malware analysis report

Static analysis result for SHA-256 238fffb109c3d63c…

MALICIOUS

PDF

87.8 KB Created: 2021-07-08 00:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 489973297adff85aec863f724cc35a6b SHA-1: 31900f3df719ea7ae79ca19a822b73cc5faa8cd2 SHA-256: 238fffb109c3d63cea2933a4407875aabe66c70f24e08fe6f79874738543e3c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used to distribute malicious content. The presence of a link farm and the nature of the URLs indicate an attempt to trick users into downloading a malicious payload disguised as academic material.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cae7fa1553---dosetas.pdf In PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b8be0b6e4562a77f4d6bc4398b8980c3/nezewalaxogijevomagotex.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/tipuwokigodalin.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa7e3d23b---35077137554.pdfIn PDF document text
    • https://led7.ru/file/87072232997.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71ab1d2bd---mitovupag.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/48248328113.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/85260352068.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6aff692ffb295aa62ccd3d050a456c32/32397535656.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/83148dca4fdd0af9873b32b69f1cedfb/96027122855.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/14012447674.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/xobigirumejikewevavo.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a435ea0938087db5a6492699211f8671/82921172108.pdfIn PDF document text
    • http://splogservice.ru/content/file/52213002309.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/nobudumev.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9444a9a2bf5ef1bb624590082c14433b/1197297157.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160859e37b3092---xafetupuxumov.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5d5aaa4ab40854093bca97b0c8a76b30/samupiwezexulowo.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cf4bcfe98---28029524337.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160a601e476ee9---9630281302.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/mexedimorumazo.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/0f184e6b80a5b6c968dc60fd65359f98/jitofubag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=academic+writing+from+paragraph+to+essay+pdf+free+downloadPDF 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_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 17500 bytes
SHA-256: fca5dab1a329027cd654eec86318017d0f46df88725367aa6824b5a17938cf91
font_01_sfnt_off00011f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13773 11248 bytes
SHA-256: 8b4771faff78948dbd6f5c3e07dda0698d2698029a857d3b3399cf454a1c094c

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