Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d7860c546a00e5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 12:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07fdd4addcde29ff02307101986431cb SHA-1: 8956271a563a58e929897f333b77da6a168c19af SHA-256: 66d7860c546a00e560abfaebbfa603775a8a70068db30a0f54a9dccb51871ef2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly supports maliciousness. The presence of multiple external links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/nedosimumogiguzoteb.pdf In PDF document text
    • http://pm-ural.com/uploads/files/botuzugel.pdfIn PDF document text
    • http://masonhn.com/d/files/derusuwumofaposabe.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210909211157.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/54fa817d4dfb76d175ae23c012455201/zuwemef.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/64673937354.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16110469670.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/80883484889.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/sikapibode.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/54697183739.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/65421527224.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/girapubukoliwe.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b515dc1eb0---zagufekamilelirawufov.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/kajet.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/kikelulubawowuweletapev.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/47ebd57fc283a2a9b81856dab848d8ff/nudojomozogelo.pdfIn PDF document text
    • https://steammining.com/userfiles/file/64530489128.pdfIn PDF document text
    • https://afayl.com/userfiles/file/liguki.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/11988326834.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/pijuloguviwomovutara.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/tulujepamikumiluxuregul.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/lozufemit.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/13674389258.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/51842365499.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/bevixoxopugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=elixir+2+appPDF 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_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 17720 bytes
SHA-256: 0d2e56c79b926ac7720d500a9718175f63e1f265cf00a05a3d30629063d90f60
font_01_sfnt_off000107c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 9828 bytes
SHA-256: da7f5652d12ca31084052250813f02f5c0dbc1b26ac3c15c14bc563fd311bc8b

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