Malicious PDF — malware analysis report

Static analysis result for SHA-256 91766d33388806d5…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 19:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ba77cd44378397a8117bab873c9d051 SHA-1: c991aca8554e4d76c2a91dee41360251eaea2ffd SHA-256: 91766d33388806d5b1df0371b7a920e6eb6709732f0e0d72f209e966ed871e79
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to deliver a malicious payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0cffac9f3---kabikudiroxef.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073180378c6e---rulagemabagumenexev.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/4452863202.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/3ea4dd0faa76e1e5a71241cb090d3a65/movujotovub.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d49e8c9cd65920562d04cb1dba3e64db/dedojivamuzesiwejokureto.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/minufilumusivemaxivaxum.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/60508667491.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/72462260420.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/2c436aa8728f1fd3c3d72a970b9b49a3/valunudoxomuxa.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/xikizen.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086c15a63596---65423371309.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210812_3ED43BA5F8BF124C.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/58468379001.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/1i3b7pesditpkd6j0gsvsdea5h/fomafubemijazavozujozuwar.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160883649121b0---sobiwaxer.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/feveguzamewopezemomaxak.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0772d026a---60970015792.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6b7043d929feba4e50c9ea7642c38857/ronire.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/pelizaj.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/fifelajeku.pdfIn PDF document text
    • https://parkettworld.com/upload/files/53314175727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ss+304+chemical+composition+pdfPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/50028615905.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_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 19036 bytes
SHA-256: c41e6f78694e6a60856c14c92c8faca3ed19d0ab2a79f0730bbb988b1c70036a
font_02_sfnt_off00012f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F32 11232 bytes
SHA-256: ae791c0bf900d30500f7523a6ab17119dcc5b3e284842dea38da6878b2422274

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