Malicious PDF — malware analysis report

Static analysis result for SHA-256 40307e2a830218e5…

MALICIOUS

PDF

78.5 KB Created: 2021-09-02 12:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dda8148c89f3b96c645d03196e0072e9 SHA-1: a2a903ed30060b4f2866380f7975c4668f4e6054 SHA-256: 40307e2a830218e5231a3874204fe4d9df21e4ad9fe92fe5c28607382bdfa105
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting it's used to distribute further malicious content. The PDF structure and embedded URLs are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c35bd810d2f---39624861708.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611f938d8c15d---jizozitesopo.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/rokavojij.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/ketuleranaj.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/bobazaliporekapifafiga.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/3086706750.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb722401e8---6063996076.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/625b40c26ad8a3e26891aee4870dd248/98710709912.pdfIn PDF document text
    • http://garderoba.sk/images/_file/tuvakopogonebatiz.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/xemep.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/03ce3acf7a3b619945f747466615094c/kevowikopuwixupomisowis.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/2044083182.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/jemumidawivuwenezoke.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/df6pigbauhtif5ta7f79lm0pp3/59565861427.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/2bbeefdde12b0fe606dd50088313444b/tubebosekakawuvekux.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/42128319955.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/jufulokatagopirijab.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210608000954111.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1f62072e38606980532e9d795ba5e7e7/35575302639.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/tizojebuvoge.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/parozedexej.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/55c54eae6e78b52bb4129617c3b7a8f0/gunaluzulabitisofujego.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/sinawosirebis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=glutaric+aciduria+type+1+pdfPDF 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_off0000ced2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED2 17544 bytes
SHA-256: d21ef98990309239d01e898584b724cb0e5bcafe8a8cffbed56b318cf836b1fe
font_01_sfnt_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 10528 bytes
SHA-256: 27aed3657ec03e3d5bc98a27de8d49d88b3f6b886d1bbf3d15764d9a4d34dedc

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