Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d15abf0aaca52ad…

MALICIOUS

PDF

75.5 KB Created: 2021-07-10 03:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2a05973ed9a4410c7d544ad499f10b20 SHA-1: 36f6a47e575c669720d02fc10f299b7bedf5f3db SHA-256: 0d15abf0aaca52ad19ab257e7017bc8d00ce302095accc9f8087dda4b8957a7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to host a farm of links for SEO poisoning or to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=elevated+water+tank+design+pdf PDF link annotation
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa071d60813---54692803475.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/foremopifix.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160706be01b2f4---kopozizedopojej.pdfIn PDF document text
    • http://netflor.pl/upload/File/zirit.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/mirajaxonaja.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/bajovunetu.pdfIn PDF document text
    • http://mega.kz/media/upload/files/68273059090.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/46288232507.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/99146556538.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/42325560572.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/sj4ir9qlcor2tcp7oim1fgg0cn/wevikiponalaxagopojibog.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb713b0349---47861831210.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/38628521788.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/62661327173.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zusisavulunifatepufeju.pdfIn PDF document text
    • https://ikima.fr/uploads/file/26463040219.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608286f8855bf---xotuxomutev.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/45436791145.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/943466e59808da92ba439bbffb653f72/86367268762.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210529011250.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/29464482179.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/letafagelibupowiwuz.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/78852206203841340f3449290fc2bbd9/dabunotaboxorowuwu.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_off0000c2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F3 10780 bytes
SHA-256: 62bd7243f387a3dddca53db9d5e46e234140543fe9ded4dacd6498c2644612ed
font_01_sfnt_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 18080 bytes
SHA-256: 89eb0e5e9f432735e36a1c4736373637610624ff42e8e01dd317976de06b0816