Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe927816ab7508d…

MALICIOUS

PDF

88.1 KB Created: 2021-07-25 07:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db45d01eb38c0424c24eb0fef35dea90 SHA-1: 6df10f4965a637a84b1508fac1ca5d3a2dee21a8 SHA-256: 9fe927816ab7508d3ad7aaa9e84179dccb9a20915bd9c7e9d9e2374dfdffebf9
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.southdownscellars.co.uk/ckfinder/userfiles/files/43556722678.pdf In PDF document text
    • http://malagi.pl/user-files/fck/file/90087079144.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/xesojapapagaredipano.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/20363031527.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/resamiku.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/nufewokalu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c40fafa642c---82383126422.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/le4q0q488pgu0oftacfd5l6io2/16619724998.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a27525946fd---44585841052.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608003a7863aa---49549243324.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/samadozi.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/dufetubezukebax.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ejk7fgk87nnlubhlqlc8gkkc6k/52998161076.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075e24db8799---72207714372.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a944e006a81---29467108727.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90202d8aac---boruzogabubo.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57a85894c9---35042478460.pdfIn PDF document text
    • http://cga82.com/admin/File/11019534463.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/g4d4b90cucr9fgbqemuq6jjvp2/65866992921.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/43083929780.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/vaxuwe.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/ziwirixirulaxuf.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8452149f5---71183176428.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/monujixewidulezesot.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/lesan.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/giwuvezebejip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=to+kill+a+mockingbird+project+ideasPDF 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_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 11184 bytes
SHA-256: 48285abe48caeeac26625d821714f26945c584b56c1d734cbf706357554fbc65
font_02_sfnt_off0001263d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 16924 bytes
SHA-256: 71bfd344dbf94e4e89640050f61065eb57aa33b9fb5fe8cfa1ec3a3b64b68ef1