Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7293add480f5ae3…

MALICIOUS

PDF

72.7 KB Created: 2021-09-14 00:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aea93b564256d17bc4a8bedde7d3cd89 SHA-1: a4e780e6fb19e4fe82ea7a887cac9220b106b1a1 SHA-256: e7293add480f5ae318845a6f6d9d076ac5ce38475222f8a0fe01b99a5640ef1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of compromised CMS upload links further supports this assessment.

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 https://highfieldhousehotel.net/nbloom/fckuploads/file/lofuxe.pdf In PDF document text
    • http://sola-brothers.com/userfiles/file/pitelu.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/jiragesigutamulim.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/59949569496.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/tofudavorolopiboditiku.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/24145211051.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/8889994031.pdfIn PDF document text
    • http://15881588.com/ckupload/files/lanozidojokelu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613461b1dcb8e---suwosogofubigal.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/44590981474.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/75576456577.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5675f0159---tewodotuno.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/42120737594.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/97631977089.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/31235980033.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210910150038.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f292387de4---34981615733.pdfIn PDF document text
    • https://photojet.net/userfiles/file/petedazoxirupunaf.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/120114023175.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109091714266456.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/91762276263.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/4519183759a0cd4aa1a72e3e609a03ee/51889227701.pdfIn PDF document text
    • https://avflash.nl/upload/files/fotuxurovukagevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=game+ular+online+worms+zonePDF 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_off0000ba0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0C 16952 bytes
SHA-256: ad83f3cb39fa71354ca63aa096235880378967915cd6458720e5e85bf53c46d8
font_01_sfnt_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 10456 bytes
SHA-256: 051479c4d6410ed3db4bb3888b999fe5cdedc2b382446e681ad6cad89b6c3196
font_02_sfnt_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1