Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5aa4ea02c692f93…

MALICIOUS

PDF

75.5 KB Created: 2021-09-27 03:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef0eceb988a60413ecd817ded914e64f SHA-1: 5596cf51c1999147d902970443f82560541c333f SHA-256: b5aa4ea02c692f931c9eec12d2bdeb0a9cc77802708a4cc003663d8c7d1539ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149560098691---duxekejobadumameboriw.pdf In PDF document text
    • http://wsm.hk/images/uploadfiles/file/76221204014.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163053778741.pdfIn PDF document text
    • https://htchninc.com/d/files/59207418086.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614910da06ee5---kibetuxizinufevut.pdfIn PDF document text
    • http://weldingplaza.com/files/file/gomobemagi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432a7a60c11---26707108100.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e50fa5d0ab---mozezojejodenaz.pdfIn PDF document text
    • http://abworder.com/uploads/files/misiwedibawudejonunas.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/19595282172.pdfIn PDF document text
    • https://liguecasa.mmsfoot.com/stock/file/nuvaru.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/kivolanefizojivezid.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150f96c92c0b---85981382717.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/28820217871.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/kurafasiropubeweduna.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/5799185291.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1cc8ba17a6f208bd1fdb8ec0f2ce2c3d/79994253603.pdfIn PDF document text
    • http://poiskvod.ru/images/file/45864656140.pdfIn PDF document text
    • https://hirurgija.me/files/fuvikowati.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/xabiresevo.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/76606818357.pdfIn PDF document text
    • https://o-dance.com/upload/files/manidutixonadibebuzolo.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9027cba15---zewugafuzafemepugovabine.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-26/20210926083244604942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=instagram+message+recovery+site+for+androidPDF 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_off0000bcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD8 19868 bytes
SHA-256: 6764222d3bcfaa76c5019d982bec7aaa4db82f7e1f0b68161f863ce76bed10e8
font_01_sfnt_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 10904 bytes
SHA-256: ddec64c50fc8058a28c7a56548db76f352f24b85697256df126aa2fb5f32bb5c
font_02_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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