Malicious PDF — malware analysis report

Static analysis result for SHA-256 579d3c4823193e1f…

MALICIOUS

PDF

82.6 KB Created: 2021-08-25 02:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 428ae78c29e23acc96a7ce3f61109032 SHA-1: 71284df35fd70797a836bbbb10037fc10494b259 SHA-256: 579d3c4823193e1f35188bc783b99d2aaf8743e7334f4acb906faa256848e519
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 unknown PDF files hosted on compromised or disposable domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://naucseto.cz/storage/ramilosajugosa.pdf In PDF document text
    • https://eletvital.hu/uploads/files/6902950447.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/78079761263.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/10400993091.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160865141f0b03---88390637802.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/74224731805.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1ac5f60840c431674bfb5897625ed49d/21968674235.pdfIn PDF document text
    • http://www.heksan.com.pl/file/9708131812.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/gc9fev64anr3jeellfef10r3i2/58605675825.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/pekibasuvufiranexi.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/6348705802.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787d1d6e2f9---53538672891.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/xides.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/79326113481.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ff942e10dafff766aea189f145e3f592/13218970504.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/nulijagesi.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/zalupigubusanej.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/51522624039.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/83717118643.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/24912430215.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/476c0a2e6e87bd9ae275267315709222/xisefikozidenujome.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/k0kehch71ful5egq3ui12kebta/tadubupudig.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/27242621667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=using+the+energy+conservation+derive+the+expression+for+the+minimumPDF 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_off0000de16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE16 11412 bytes
SHA-256: cf041ddc51bd98ac0e5d956ac9eb498c6335dcf16984635f14a9448f27c42444
font_01_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 16476 bytes
SHA-256: c7f590d28a6a07316fb37fa47a395490c7d755dd56ad284d6f1f6837b24f1e73
font_02_sfnt_off00012389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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