Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed95a1b5c2ef298…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 17:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dca17e1995ea3c30b854ba88c55c0afb SHA-1: 6a6f6553b2e907bebbd96028b177a477a9b40f02 SHA-256: 9ed95a1b5c2ef29885c5fb2d5f8568c0cb93fbf9316c8ccacbdc2deb9a1a3e92
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and compromised CMS upload links indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/dfd182544613dcaaf78a3b56841cf093/kulawuk.pdf In PDF document text
    • http://chatyzvule.cz/uploads/xaxidekituduboba.pdfIn PDF document text
    • http://babamoleskine.com/files/file/12519196058.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/12414466644.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/48422343988.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109191815404169.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/ruwete.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/natutikivuxoxoki.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/mapovutupubirisekagemajov.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/gomonalotibusagito.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16318331453773.pdfIn PDF document text
    • http://7serve.org/userfiles/file/20210918034422.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/63736888379.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/92841869567.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/65113143834.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/sadiluxafaragesuwoz.pdfIn PDF document text
    • https://kuepancong.com/contents/files/sebinozebavoruxaxa.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1e80772f2---febigetirojik.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zumosijodisosefufasiwo.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/99067209165.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/gawizogiwokofujisixuj.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/65271498359.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f93194b48e---55523464078.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/71dd5hem68f68bcutmf499lua2/43013543529.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/kotopuvabezasefom.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/60684281028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ana+mon+amour+full+movie+onlinePDF 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_off0000b78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78A 10256 bytes
SHA-256: 4291d3e2a48e028d0f86a38dc5303deb0db152a1a3d459d0e5f6b4b97b71895f
font_01_sfnt_off0000ce8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8B 17760 bytes
SHA-256: 42e03ebd57a5826fd4e65604a0873ce3aa506b52cf95abf37216ae0cd2454b8e
font_02_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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