Malicious PDF — malware analysis report

Static analysis result for SHA-256 befd6c9c19e7895e…

MALICIOUS

PDF

100.2 KB Created: 2021-06-15 20:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2cb2adb5aa50a7bb81ee58e62817c9f4 SHA-1: fc0f21224105ab15a680bc719e55de1be1bf6b89 SHA-256: befd6c9c19e7895e42b97e93838e816dfb458e49f5982e8da31f839a3b14e970
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links, many pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL findings are sufficient to infer a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=nda+last+year+paper+with+solution PDF link annotation
    • http://b-solutions.net/userfiles/file/wolijavunebu.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee951c57bd---rufozor.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/98139518237.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26ee16542---18802827707.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/02r44ar3b5pp1jl0hcm7ulfuuv/jimixagefufajadodani.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5888f0ac86---45385111440.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160775a412816e---36316651584.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d147e12ef---89506231956.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d4e567336f8ebf1109a9017b77bd35b1/13959688811.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/luteligumebele.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/li3kjf8neutu30bshpjvffr4ki/rugot.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file/%5C/2021052800311939.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/buzorowafivapomamonisuse.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5671f66da5---10131107611.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/21893163920.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/0789f4af8cfe54dfeb1d58f065124b6a/tavogomesubujoxawitok.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/9bhfvcbraaq62mq2d9k3ckav54/xusagiwatuzo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d130e42e1cc11c92d6d868ad92af7f09/judowisetivuduxaxuxekumus.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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11396 5208 bytes
SHA-256: 55a83a72f7ec5c864872298afb219ff47ed66e3b7b9a3261d49af326f6229d1e
font_01_sfnt_off00012559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12559 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off000130bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BC 10540 bytes
SHA-256: ce77f373c5dbafbe9c37e2a5fc73c018722ca7f0df702bb2ef59c921333703d6
font_03_sfnt_off000154ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154EC 15564 bytes
SHA-256: 09e6d9c06b90d7dbe03187190ae426a6d90c6f2eea52793db2402e1c56488e15

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