Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aaa788f93a6330f…

MALICIOUS

PDF

88.1 KB Created: 2021-08-02 08:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54e1abb3239efaa10580bbc842b45aeb SHA-1: 9881e6a7d60aef324a17a05e3e2569c1ffae65eb SHA-256: 7aaa788f93a6330f3c92486d86f792852fd2fda29a9f4ce463da12b094d8cefd
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://nensi.si/upload/file/lezilu.pdf In PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/49744666182.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/47159979956.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/duviwaxamobopemakodeli.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/25305356932.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b3ce6ce1---guletugikofusofunumudop.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/fogoguxikisokipojoma.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/lutadave.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959b7776872---vidozagibijomixamu.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/60438705607.pdfIn PDF document text
    • http://synowka.pl/galeria/file/3393062951.pdfIn PDF document text
    • http://edgecs.net/documents/54538438969.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4o8g0lr1htksp6n6142lins6io/66403629293.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/c19jkbqileqfbaoa40kv7od8e0/97247778021.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b051937dcaf---62766178422.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/rududi.pdfIn PDF document text
    • http://www.asslar.de/downloads/vuvanelina.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7ea15913c---wevikanoborojesu.pdfIn PDF document text
    • https://edarky.net/data/file/dakabufas.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe5126ecca---86911667696.pdfIn PDF document text
    • http://dogable.de/userfiles/file/bowapupurufesajubatekira.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/xuxanebidosabifatiz.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/91225936683.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/20199610574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+are+the+roles+and+duties+of+a+doctorPDF 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_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 17752 bytes
SHA-256: 936939f20961cb173f8ad794b0038b6289836d922536383a37d797149fff0e45
font_01_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13985 10664 bytes
SHA-256: 5f77067a1aa96b966b7c7be70987384dc4785b5048c9b801899d4a839e940172

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