Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e2153d688bb555…

MALICIOUS

PDF

75.0 KB Created: 2021-09-04 22:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 932c8a359307b9a804f77bba3b1bba2c SHA-1: ce5d7bd29af7144c373e6adf1a930691576d51b5 SHA-256: 73e2153d688bb5559533d8d44e7cb01a09558d57f14c29ae8a8d9c35f58ca86b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://chcial.ru/uplcv?utm_term=centurion+d5+gate+motor+manual+pdf PDF link annotation
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/0e2082abc51ee6fa4b1fd6f10b5df511/zagiselubupabufenopezudax.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071b4f618d52---47696716920.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/18932658012.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161175a04a17ae---misagedap.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/53680097375.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083129db822a---86705837428.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609149946d0fe---xuzevenifebemuku.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/gukibutenaju.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/4ae4c7de788a33b385161cda1b7bc08d/begukegewat.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/83f750380d298bd208e01e0af1172627/pixexosokadewuro.pdfIn PDF document text
    • https://network-italia.it/file/nilutame.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/52306744385.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/76222379887.pdfIn PDF document text
    • http://nnhs1964.com/clients/a/a2/a2d7b74ded15306de89ee4bbe2f7ed3f/File/22355130387.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/tulisadisi.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/19641117875.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/sikemitavatedujufa.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/bakijemapuvexolarab.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/86861367518.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210822_07171BDB72323A08.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f92a9f95a6b73f9c1f0ed31dc6b564a6/55094083677.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/5gu2532kaarq206cd9q6m07gi6/tiwurijodugenagifefo.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/26982373421.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/tabulirunezaluziligagis.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/bujuxubaguva.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/8ca3b206c81b7fc6e196c07bacfa5c14/94352174128.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_off0000c05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 17412 bytes
SHA-256: 09ea43d3a593ea8aefa19aed790c6275190ce1e81ca5dea097861cbbc9812e70
font_02_sfnt_off00010572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10572 10940 bytes
SHA-256: e056d86de23c34c617cc2c6aa660dc79bbb7a368e787d8919a2432f0f63fd325

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