Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e61f5a04277c0c…

MALICIOUS

PDF

73.0 KB Created: 2021-09-17 18:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5176c2321c631e8c2f77c8932a4658e SHA-1: 3429f0cdfe0cb4d5960c990e994d853dfe9f3624 SHA-256: 11e61f5a04277c0c64d4e2eed1cabfb277f7238397fb1788bae51909d14aaf83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware delivery lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2d09a845---mexegob.pdf In PDF document text
    • http://www.uc-kushiro.net/images/library/File/81690022186.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/bukasujamigekawuzuj.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/subuzedite.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130d70897581---jadesatelox.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/domeku.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/17590980204.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/64228186880.pdfIn PDF document text
    • https://2acontractor.it/images/file/20632441524.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/54029197257.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/migobi.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/56134997542.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/derozisifivesovulig.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/76840255490.pdfIn PDF document text
    • http://bulmarconsult.com/files/jixavesumebokilage.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ef0739321---3749510749.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/70601590870.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/riwoxu.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/miwusapat.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/19410146883.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/47229455007.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ee2b95b9---wapasuzijovagutitefuwo.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/kejibegojevuritegekevep.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/vivoxararexetowosaw.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/nabogitevinutegenisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+download+vidmate+originalPDF 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_off0000bba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA2 16644 bytes
SHA-256: c1f3b658a8e65294fdfcd393ef3549701227295a513612624a0294043cee576a
font_01_sfnt_off0000e6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 10568 bytes
SHA-256: c56c0a6839156599de385f05c2153775be4dc756cdf62f37ec4402b8c544af41