Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd3fddfe129e2cf…

MALICIOUS

PDF

88.0 KB Created: 2021-09-21 05:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10ca20fc337d06e80e060d962680b163 SHA-1: 17a9d85facbcfad7efe61cf54453d684d7452559 SHA-256: cfd3fddfe129e2cf6b1188be3cc238884c293cd417ee8e2279b2c56fb28eaf7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest a downloader or redirector role.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://naveenent.com/administrator/imagetemp/file/juwalemupodowigelezabake.pdf In PDF document text
    • https://dgssu.com/upfolder/e/files/20210905155440.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2ac5e182c269d63cfd4c7f2f4e16a3f3/83890888852.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/42387413123.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/83578495798.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/liraxufegur.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/20413503501.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/vopozux.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/57089355505.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/49703592138.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/niruvur.pdfIn PDF document text
    • http://hongdacable.com/d/files/kowajafujulaparemef.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161356459bf571---tajalowoleve.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16142f066550cd---kuzalibunoviwividimelos.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/94170496032.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/manajikiviwinajemabobova.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/25316451177.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/f1qopcg7765oquv66j6pojfd7g/76546298815.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/11655818929.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403da176cd0---90276138702.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/22857357537.pdfIn PDF document text
    • https://fobh.net/userfiles/files/felewapagakituza.pdfIn PDF document text
    • https://bak.vn/upload/files/63968499308.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/966670765f5713d1b80406d9a3fd47cb/lulunujafiweligevelapimi.pdfIn PDF document text
    • http://labonscafe.com/userfiles/dajusasoruwemoxorubosizes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=demo+games+in+play+storePDF 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_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 10712 bytes
SHA-256: 1d8d9ca2fee0359d8a49b674a5cf1c5ba2ac0fbbe190d49129244b235d93f262
font_01_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 19840 bytes
SHA-256: 582d42bc8fe632dd7fa1f3e1d6e6802656e6d7bc52a7138b892ef0e39e59c15c

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