Malicious PDF — malware analysis report

Static analysis result for SHA-256 96dc3edbfa1d0661…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 16:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f9472e24b09151e94db61b1e40b5cf6 SHA-1: 9e3c4084c28df55b844ff5ebb91cc4f1e89338dd SHA-256: 96dc3edbfa1d066119fee2d0700a473510e476ba600ad4c86605bb64166fd20c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of multiple links pointing to potentially compromised or disposable hosting sites, identified as a link farm, further indicates a phishing or malicious content delivery attempt. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tekizolasyon.com/ckfinder/userfiles/files/84000534902.pdf In PDF document text
    • http://studiofapas.it/userfiles/files/sexixal.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/38002963583.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/27488324164.pdfIn PDF document text
    • https://digicpictures.com/downloads/11126794367.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/mesatividazazemajaba.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/wesulivekaj.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/38559151564.pdfIn PDF document text
    • http://sushi-belovo.ru/files/92060545580.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/bosanonatuxedotosata.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/84672615761.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161417bd7d168d---91438250680.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/watirunid.pdfIn PDF document text
    • http://irollee.com/userfiles/file/titupat.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/79228584164.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/66015572096.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e825798029---lajixegetu.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/52691054064.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/30216333998.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e562ce4431353440fe6f12c39637b326/46934248457.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/fivefupavas.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/mokelezesu.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/1146807411.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/jozivulejomomuwamojakenis.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/rovafumuribupur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fear+and+trembling+and+the+sickness+unto+death+pdfPDF 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_off0000b665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7C 11376 bytes
SHA-256: 217b808b24dcf6252422be3eb65635546c96f6b5b155c98d6c986836ade034b3
font_02_sfnt_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 17472 bytes
SHA-256: 6c032c1c906bff8e51619e0e0d0c6758107f388a19a8b9c1af089bee3afcaa7b

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