Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64ee40a2e2ca8ed…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 13:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37187dc8b12c1f2858497b5ebc9dd363 SHA-1: 408d73f993e9b3650c7011922465ce608e689153 SHA-256: a64ee40a2e2ca8ed8a2ffbfe795c982387b15b892af1136bc4fe19605bd44189
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://crewmak.ru/uplcv?utm_term=harry+potter+hogwarts+mystery+mod+unlimited+gems PDF link annotation
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/95441843810.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614002e63abbf---jenev.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/muwizerawipapipon.pdfIn PDF document text
    • http://k1a.ru/images/files/file/zasorokutabupibagezikafaf.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/xuwezazaliwubaruzulavev.pdfIn PDF document text
    • https://podimercrm.com/img/files/toneten.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/porogefodupazimadaramejo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf4c489ace---21869475807.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/49529443111.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/93245901726.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/3405835454.pdfIn PDF document text
    • https://salonrewards.ca/images/file/36431817020.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/ritebozinerurutinaluvosul.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/reporumudobofesulavob.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613746446a9f9---31377840350.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/86214116272.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/9407161.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/23622336197.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/nedanobalumoguberul.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/20876965626.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9ff4f24d2f6abdd2cb83f26d408be2e1/wuranuviwi.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/79353114977.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/wazup.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/26802283486.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/87203787477.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_off0000c849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC849 11132 bytes
SHA-256: 3607e6395080560468332b54843d8c7682e532d1a16b18af54ddd27d62eb278a
font_01_sfnt_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 16764 bytes
SHA-256: 08812f5a2986867be86fec42498f48b98c13e6e4685ee36daa827d496260ba0a
font_02_sfnt_off00010d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1