Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38ee51fb74fa1dd…

MALICIOUS

PDF

88.3 KB Created: 2021-09-18 02:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 794919ef7486bc58d1a1edc25121836e SHA-1: d99d1bfd30c6faf24ff19de9883c837bfcc88dcf SHA-256: a38ee51fb74fa1dd7f8a1eb9ae8ba8182e3e56f72f52a70974dc049be7f6f937
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://theartofdesign.nl/ckfinder/userfiles/files/ziwanatavegewomodarugu.pdf In PDF document text
    • http://gardens-spa.com/user_pict/file/matugulamopunefepedu.pdfIn PDF document text
    • https://satesayap.com/contents/files/rawer.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/3765323956.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/patub.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/sarepezubonazifibiwixiz.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/93677444295.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/jemowijikureji.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61411873054.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/63099240158.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/8769360237.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613900b2072cc---wazesaku.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/83642041125.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/52942884228.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/55808460738.pdfIn PDF document text
    • http://4rrecycle.com/files/file/3762141851.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/64702943932.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/86972797347.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/22219893386.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/36fq1u2qn5hb5viebe8ii05hca/9658642573.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/menoresuwubaki.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161406cfd1b570---78032858302.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/87295618880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+fire+red+rare+candy+gameshark+codePDF 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_off0000f0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 10988 bytes
SHA-256: 5785ad01682ec7a2a721becb13b14ce57f0dd89850c48963824058df7badac69
font_01_sfnt_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 18964 bytes
SHA-256: 598a2fcdaadc107b030c097e4f435175f5b4508bfce79a3afb53b7b84a47dcba
font_02_sfnt_off00013afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1