Malicious PDF — malware analysis report

Static analysis result for SHA-256 441e369a09b319fa…

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 09:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 872f12aaf5bdf74c306e56a8788f6574 SHA-1: 4e0da64f4afd54abb15d8c2105441d4ef13d7371 SHA-256: 441e369a09b319fafa990bf3d1ad2f14432f40bd19b93f73c8564b12a5c0f547
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=scientific+notation+to+decimal+notation+worksheet PDF link annotation
    • http://wintec-samu.hu/uploads/files/goxigurutakoson.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/davizinuvatifurifizab.pdfIn PDF document text
    • https://phukienbep.net/media/files/29531749522.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/d4trcdee5pr2nk0ks2m5qqvpfj/89931990362.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/desuluwexogesex.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/50649417449.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/xokawujetepovupesa.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/qkm8mjc53hscvopl85tsv8qgo3/kawomokafa.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210719_060703.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbd126eb66---809854109.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/243d81b4731be532b617a443ff520021/rogepuba.pdfIn PDF document text
    • http://i-physiology.ru/upload/9362125380.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/73cpi10tqtjdlma3isiqsvtrcs/tonibazologenomo.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/56561460776.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/52531550153.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160749190983b9---rozibagigimalofow.pdfIn PDF document text
    • https://majubesar.org/contents//files/tizatelinufatap.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/dajogetajalefejuvapi.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/15138276934.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/f22d444f1bb068a312ef997ec83c4f84/datasopedadoxufuguzum.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/badubegol.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/roa5lm4ms066p6bkq44jqdk8fo/pokazagurapebeb.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/14491332248.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_off0000c1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E5 10992 bytes
SHA-256: 6aa4cf7b47b32ec1a9c3fb162215c7e529474e854982776b7952f8a0540e687b
font_01_sfnt_off0000db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 16868 bytes
SHA-256: 191444a1ccc6c97d4af24f636b182d963810fe63537115abcad85c94231ae8f7

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