Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7d5db2d038e607…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 19:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea192b11b89dab228e50b13590dd51fe SHA-1: 9379593cc4d7e526bd98d72deff08a6b506c7eb8 SHA-256: 3d7d5db2d038e607c3107f84bd69e76df7eb643137ef59615dfb24fc4679f819
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external PDF files hosted on compromised WordPress sites and other domains, suggesting a phishing or malware distribution attempt. The presence of multiple PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of linking to potentially malicious content. No scripts were extracted, but the overall structure points to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1415e8af5---lemaropimakerelidobadide.pdf In PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/vozigawafofumabavola.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/puzawabaridatakunasal.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2cb4f05e4---97497086589.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/43460808811.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/80761871648.pdfIn PDF document text
    • https://nyig.com/files/file/siwebewedame.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/mevomafimi.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f3be7733---posetedizigeribojixiruder.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/jaleva.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/piwonewuwik.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/supekuwexitasikajemile.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/pilabud.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/zikudaxakeg.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614036393686b---xulapewaganinili.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130131722b60---jofakarivobi.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/5385799277.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/90229077225.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/90606595515.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/91435416731.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/gawuzisepi.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/3392604994.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad13e430f---43505114996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=most+populated+arab+countryPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/399d251bf59493ec05c5d741aff91ef2/mojep.pdfIn PDF document text
    • 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_off0000cbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 17864 bytes
SHA-256: 0fd639ef8bb917a41d2bd3ceb32e413150c936ca0d70441cebc9be3180048a99
font_01_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 10760 bytes
SHA-256: 8dad978c3c1fbc4f20e0d1ccf8ee3c4f6f91dab154046b6c4288e0ca07c4a700
font_02_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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