Malicious PDF — malware analysis report

Static analysis result for SHA-256 4619d8943f5f4c27…

MALICIOUS

PDF

90.5 KB Created: 2021-09-09 18:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e5cca4a27c7872560749f61529207057 SHA-1: 4cff728a73d4daa9c15bddee840a3df1be0e95a4 SHA-256: 4619d8943f5f4c2727411eb68dcd31bf4fcfba6f26aa8d0fcf5f085e560638d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=i+ten+mobile+price+in+bangladesh PDF link annotation
    • http://tsg-edinstvo.ru/userfiles/file/wuxarosomuporotatuvipive.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/32139994448.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/72641305623.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/mokfeh0v4gs16jqp5npm47r83e/87274063422.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/22374118452.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/vuxogasafazoparo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/aae1e114674f6f3ca608c3bf09f467e9/xozamavuxixuneguwulo.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/80514252078.pdfIn PDF document text
    • http://tfforming.ru/d/files/petadigida.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f6d8a8f2e---satuwufuguxalasisokumefor.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/raronakesi.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/72446918255.pdfIn PDF document text
    • https://wsbtitan.com/images/file/69521650398.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/87669309218.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/59509964495.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135920ed5923---81719526500.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/wokajajod.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/19315672798.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/bilofasiwibikevonukabo.pdfIn PDF document text
    • http://ativn.com/upload/file/26560190192.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/900181452.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/22623027133.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/zogij.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/zilaz.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/62133201016.pdfIn PDF document text
    • 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_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001138c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 17908 bytes
SHA-256: 693ab087c69841b0d2d5799eb0cdf86cb6f680fc6f885dd9dca92dd19e2cc828
font_02_sfnt_off000141d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D5 11052 bytes
SHA-256: b37c2d76aa9284111c6d0cd683095457951175f82236e78355cae23c1bfb5cc2

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