Malicious PDF — malware analysis report

Static analysis result for SHA-256 06380e81830dd3df…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 13:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 893766dbff94ca7af9cf91bcdb4c70fd SHA-1: 535630cebfe508ec0e3b4b7d388c1a40bf87715e SHA-256: 06380e81830dd3df313e5848750a7524f31ba2b56f42be0d304f2a79052e7907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs that point to PDF files hosted on compromised CMS uploads, suggesting a link farm designed to lure users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a potential SEO poisoning or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://k-souz.com/userfiles/file/9506445341.pdf In PDF document text
    • http://ventima.ru/userfiles/file/75543997020.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/nisevepem.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2371ef382---36101403647.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd0af1ba20---tajovokuf.pdfIn PDF document text
    • http://hadt.vn/upload/files/xasewexijijisufejat.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/bolera.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/99796307404.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/18044c39f006519aaa2101f64452345d/65649169360.pdfIn PDF document text
    • https://ienter.bg/files/fanib.pdfIn PDF document text
    • https://chsins.tw/uploads//files/202108101353471674.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/fowezofapebivefar.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d77206302---87172027575.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/5403e7eeec8a719344dd9579f293d5b5/raxoj.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/rufozed.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/30195943986.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/44293151851.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nuluxutijorumalapavixo.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/3bivo2is4f3e5div9202okioig/40589386222.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69b2363bb---nadigimavopetukazale.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/judijalatavaganef.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4818c4cfb8---65953707608.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/26455281031.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/toxevasax.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815a34934a6---sisekitizibi.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/406f0828d627d3576bd2e47208072c88/jogufagevixo.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/85618375961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=a+paring+knife+with+a+curved+bladePDF 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_off0000ce5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5B 11076 bytes
SHA-256: 400f6e560fdd5f4d5ed23fc6f316eab206e6a8994481dffdf6790f391b9fe85a
font_01_sfnt_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 15940 bytes
SHA-256: cd7b565597f090de54452fe5aa9929e42a85ad9f25f3a66993fad9d40d31e625

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