Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceeecf50d353f8b6…

MALICIOUS

PDF

100.2 KB Created: 2021-07-27 21:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b33364bff97b8080eba51392ea93e4b3 SHA-1: effbf9a627023e479733d72c9915d24161e788ad SHA-256: ceeecf50d353f8b63d806b6e4fe17f90bea95d09ad85352d1551fdeff45cd101
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, with several links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient for a high confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bbb2c0e0757af3309c0de4780ffb9237/58635454485.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160985ccaba7ff---funag.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/645556acec969bbcd17e0097880e5bdc/xabexakozivos.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/munivedisi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989656f344f---nanut.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c16290af64---9254001813.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/wumurared.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/59218739688.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/525180e0e122459233670dd492537014/15475776559.pdfIn PDF document text
    • https://actorconseil.com/files/file/5530095002.pdfIn PDF document text
    • https://kristinanamaste.eu/files/8592368114.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0d5986317---fumus.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86490ec237---22806867919.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/23/file/sidoragesafoxonumaf.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qmk5vnvein2ai6uart6utqf91/tonojupateraxunuxogo.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092512091299---veresisafimegugelujumane.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/506612d8ec79ca8110f48933c26068e6/33831967317.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/pajemexelipuxitufufev.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/ee8il45rbac7of5abud5rar41q/dawix.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/43479090607.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/51881903242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=plague+inc+cheat+codes+pcPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5b7a13b7f35fbb79983b10b61b83c191/51409776507.pdfIn PDF document text
    • 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_off00012078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12078 10792 bytes
SHA-256: 91f957bc37339d22dd021f88839a2665987f1fd2a0f10e783d71ab234e659f13
font_01_sfnt_off0001390b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390B 18668 bytes
SHA-256: 7439220e3bb36388d0400eab2794448739108e65bb33fe57808d0a42e17a3c3d
font_02_sfnt_off0001692f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1692F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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