Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7ae9d5a6a5e127…

MALICIOUS

PDF

98.3 KB Created: 2021-08-08 16:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c80059e72d9c619441b7b07f1a659560 SHA-1: b53cd50dea778c27145282ecece48a7d27233909 SHA-256: 3b7ae9d5a6a5e127e1d5d697c9489eeee7aec6181d1c3219facb5b461c802b9a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites hosting other PDF files. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ef966e31a---xarojuwototakosita.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b839d50e51e---xuxasojutufusixusosow.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/34baaeb22a91d4ae17505d137ceb7e4b/93448899886.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6bb136dcb610c79b168c34f38b2f5da/9646274537.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5f41edb560c82cdc03d2ecf89ff42b8d/44889192317.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d78a62cf1---17935581420.pdfIn PDF document text
    • http://strandedtattoo.net/file/20818542203.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1a7edf513---detotivi.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/nezepetobide.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/rekigi.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/c244477191e67e112d690d59661ae11b/vigowigunuxagazisilu.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/17103202283.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/0j6kknnpb1ntpm7b9r04upvf76/xikodawanenevuwum.pdfIn PDF document text
    • http://erex.hu/upload/file/40003324571.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/31953231352.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/p7p06s53qbdekggh8bd0lcsvr2/86201890282.pdfIn PDF document text
    • http://hifimarkt.eu/kunden/kronhardt/ckfinder/userfiles/files/67657148680.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/kinamatafoz.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/jimufud.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dab92672c---taridixuzud.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb41c0dda---99153006050.pdfIn PDF document text
    • http://hkacca.com/userfiles/negasemigumatubad.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/9098880474.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/setimun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=carta+de+san+ignacio+de+antioqu%C3%ADa+donde+llama+a+la+iglesia+cat%C3%B3licaPDF 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_off00011047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11047 11192 bytes
SHA-256: e050289271708634d949dcf5ef308a44b3d8f34ae3dea29b0f422b1694964bc3
font_01_sfnt_off000129a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A5 20976 bytes
SHA-256: 8cb6e423315fdc1efead1f4d0131c9e69ae364ba0648e347bae80a03cd8c3b15
font_02_sfnt_off00015ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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