Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c47ba2c41c4e66…

MALICIOUS

PDF

68.3 KB Created: 2021-09-10 08:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: daa38a7fc2bf61688e8c05a7b8dd81fd SHA-1: 82c67e46814e68068115503626f533d87bc8278f SHA-256: e0c47ba2c41c4e66b7e647bf50f00c5348e8aea080454eac521301086c0c8318
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting an attempt to redirect users to malicious content. The document's structure, being image-heavy with minimal text, further supports its use as a deceptive interface.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://queure.ru/uplcv?utm_term=can+u+download+fortnite+on+android PDF link annotation
    • http://zonwering-nederland.com/ckfinder/userfiles/files/kupumunikuzadi.pdfIn PDF document text
    • http://chemsdano.com/upload/files/41432537973.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/zalejasikiluzulimipile.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139059dcb95d---wiwemenaz.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/kujobasomiwik.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/28191050594.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/81160935205.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/62887135202.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/23793401112.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/kubevo.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210908124741.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/notanirukuzi.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/lilamipufuruvisu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/o8ibgfk4gjjj1momb2n4aj3snf/dunoxovupunodumos.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/90135938225.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/7510674707.pdfIn PDF document text
    • http://glttek.com/userfiles/file/1578643676.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/nimetifed.pdfIn PDF document text
    • http://rsst77.ru/upload/files/95848197384.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6ce1ec65---wolod.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/wadimibelon.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/67202452751.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/02/wixarubofenix.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_off0000b084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB084 14104 bytes
SHA-256: 61f05777a6b7432ba51f64ecdf2742cac6eae2638cb6354c2bd725033e09c9ad
font_01_sfnt_off0000d3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 10396 bytes
SHA-256: 8bf3518d6c6d9a1b8e0864e4faf851577f39d772eaf15ecf2a155e2ed06a87a5
font_02_sfnt_off0000eb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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