Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7068c9e5d76529…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 08:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21b8d460b7b1872df8665c2adef56cc0 SHA-1: b223c8bb162a7fd6c26d0abccfe5f481d9ff67ce SHA-256: ef7068c9e5d76529dfc05d2313d07c2d3f52d5089fafea9596a545effd040aed
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 it is likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host or redirect to malicious payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a deliberate effort to obscure the true destination through disposable hosting and link manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7af93c3ce---radurakejivazugo.pdf In PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e2c97d7f3---wabifug.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/kufofilibatadilutajudikit.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/97928436245.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/bamijuvixonunobowutapopan.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/88169656643.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/48999666596.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d58276e4dd---25236737469.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/zanozotugaripomitaru.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/lokomolaxijipukit.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/g6keegcpm3t97472sq4hm4fbsu/50516946561.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/xapoxedivovosuvi.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/fugudagaded.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855aba6f9a4---bipovuxazetoxukuga.pdfIn PDF document text
    • http://viorina-deko.com/images/file/fifaviloren.pdfIn PDF document text
    • http://lblussana.it/images/file/wurigaxejodozegazifos.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/56584431927.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/vebaresajozigen.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/zulakigo.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f5bde0cbc---guxikadajit.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/lekuxisobadubewop.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/jezimamepakiwixipoxidiv.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd0bd203d8---59855989282.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083b47fa617d---6911501084.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/fivenazizozipedazomezamib.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072d97f34a6f---vibozifeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=do+you+need+to+clean+your+washing+machinePDF 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_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 11120 bytes
SHA-256: 129a4a776c48e2fb3a16ad7ef98eea87026bae74644376b163c245bb8d3b5ab4
font_01_sfnt_off00010689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10689 17132 bytes
SHA-256: d4f3e94c59dc7367a90c2a42460e4d00bec8b69af542a5eec6778a96399b260c
font_02_sfnt_off0001327b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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