Malicious PDF — malware analysis report

Static analysis result for SHA-256 512df130fdb6d09d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 10:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 55baed0909fa21e2306b99a6d1aa99c1 SHA-1: 8f2ced73b331907dad0b369ba1c789baf6c498a7 SHA-256: 512df130fdb6d09db77caa1b5f5960456335c4e347a0ecf181908d18517cb537
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not directly analyzed for specific actions, suggests potential for further malicious activity such as exploiting vulnerabilities or initiating downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=advantages+of+science+and+technology+in+society PDF link annotation
    • https://barrierball.cl/ckfinder/userfiles/files/1785980066.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/luxazasema.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/12068304081.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/6007492823.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/luxeriwezuwesowezixe.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/wibelijulivumovajor.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/56901821971.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/323fb8ffbb2570d71548db5051b33637/22795024241.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/89d4f2adb55a5415cccb639d928acb9a/61716604785.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/28806027177.pdfIn PDF document text
    • https://btegypt.com/file/femirojuni.pdfIn PDF document text
    • http://ingore.cn/upload/files/80249678247.pdfIn PDF document text
    • https://bachson.net/upload/file/nekikizapumerovaguv.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/godebolamuwuwavesimejun.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e1766f14a2604eb8c54bb6bb31823d21/lupakukogudowawanam.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/99f9175b4cf579c8575e0aaf1df36128/43965076424.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/40881160831.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/85430972624.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/tobugimexavatekutopakodu.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/nalorav.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/tarapitawefixuso.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161352f9393b27---84892039410.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613528683bced---kuzomenojovebu.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_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 17108 bytes
SHA-256: 8478ca5c893f6cc87129eb63f7b885f9ef6d7fba2ecbe290d87c8ecac6bad0e9
font_02_sfnt_off000127c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C4 10816 bytes
SHA-256: 172643d82654260ef0eaf26726d6d624b2afe30a81bd8153055e0824e42c0ca5

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