Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95ea3ad21e7544d…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 18:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 395eda4dccd084a22ae9585f6a2c71e4 SHA-1: aded64b1428a593c3baae2b7704e34718b8bb649 SHA-256: f95ea3ad21e7544d8c106ebe20ab2fe2f20c37b78e667a7fa7d751590610de21
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on suspicious or compromised domains. Heuristics indicate these are likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://zensushialiso.com/uploads/files/duzukumiwokenaxojesosema.pdf In PDF document text
    • https://aletihad-group.com/userfiles/files/24959470292.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/45862360286.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86ef8dca8---lafewovuxogoxugusinul.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/97510041954.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/32545585792.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/kemeborutax.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/xozigalejopega.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/pefomerapuvigepezitedegib.pdfIn PDF document text
    • http://lex.tj/img/file/59598935627.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/mewilewumeko.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/15148685750.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc6d0b8690---vinorozadarapakopejukuku.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/gatenazilezavon.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/19730846061.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f399221991---9666325291.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/keraxonikagodixuralesif.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a825408f0---bojijejilibeta.pdfIn PDF document text
    • http://okun.su/upload/file/bebizulumizujejod.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/sofilatusiduvubuxifoda.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/tupukepogorofutiliwixika.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/xekupixarulutuxakava.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109110401325100.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/36805780276.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/63803890314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+offline+sync+databasePDF 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_off0000b034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB034 10704 bytes
SHA-256: 2eee16f9cc90fc00ce889dbd92baeb3d09af060ff1dedcdfb36ef57523ed8102
font_01_sfnt_off0000c8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 14368 bytes
SHA-256: 910560c12564224cb92f243d119d2f2f6222157cce9904c9bc175b66f02610ba