Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5eb2ec9f5833df1…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 00:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb932bdf4911e64f25efc35f45e009c6 SHA-1: 2ac0f5e6f9ea6211746907f8317f769a489d5ff7 SHA-256: d5eb2ec9f5833df1b01773601ee3747e5eb8ae72c90230967d40b086c9ecf1ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a tactic of using compromised infrastructure for hosting or distributing further malicious files. The embedded JavaScript likely facilitates the redirection or execution of subsequent stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.halpellet.hu/userfiles/files/87914639642.pdf In PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/luvugajuwobiwabobojuvimi.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/46629444988.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613892392f018---kizisawamerakuxovejaj.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/fozelijerijutotakapuse.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/lawivenugavexujopapux.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7f2c1d43e36576ea176bdda04d0ad42f/25038878229.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/88629207521.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/xefot.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/wibefulitufo.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/58130049648.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6b786cf989e32cff7314fef843cabc99/49868043111.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/gomuxo.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/raxanenotivegorugux.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/84533606911.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/gekulelofasanixaxif.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/pizebe.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/takuvuzawusenixadajumeki.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613947ea68f11---55536727108.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/xofepumupezizilup.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/669454e568000d815aa5bc37d3c848da/48271181271.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/bipetavufizusunowitug.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a740b90a9062da2bf6ae743184e09c11/60923299535.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/84216881693.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/fuzilegekofop.pdfIn PDF document text
    • http://harlit.com/upfiles/file/39555352754In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tamilyogi+new+movie+download+2021PDF 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_off0000c8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CC 18664 bytes
SHA-256: 5815626bcbe0a8162260d752ad5ae7c0e18c00b1047d184ab4081e818ea30c8f
font_01_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C0 10748 bytes
SHA-256: 2564412e74628d7409f56089eb3e4b03d085a0981f17396e6ccc18d8029d753e

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