Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc500d6c8c96dc47…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 18:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fabdcddf3fe40d1c34d74d503a065985 SHA-1: 3cb47358686eaaff142073f197d352cf7e996bf1 SHA-256: cc500d6c8c96dc47126406a5e1b587c462752e23d9a870dc541ceb09530c3325
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and presents a full-page image designed to trick users into clicking a link, likely to download a second-stage payload or redirect to a malicious website. The numerous external URIs, many hosted on compromised CMS uploads, further support the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • 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 https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4967d37d58aabb6b25e3b7281475b4bc/rubet.pdf In PDF document text
    • http://standardamulet.com/files/files/vosavari.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/81003023118.pdfIn PDF document text
    • http://szcftz.com/upload/19654676244.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/26129893564.pdfIn PDF document text
    • https://synersys.fr/contenu/file/93294876719.pdfIn PDF document text
    • http://gr-chem.com/upload/files/70150730730.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/lafizosope.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/dafeguv.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/82529016795.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/gafelizevadajevonaxupono.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132276231a2c---vedibalizuwajaw.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/sooqb84l6cag1s2ov98gshuoi3/pekigigurasi.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/64872309818.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/pejaxogetojop.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/5512618813.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/97718030787.pdfIn PDF document text
    • https://costarica4d.com/contents/files/73031642745.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/rubixalup.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/16388914279.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/girovugotavexixebas.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/lijalevawipikafidejukizaz.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/58461435879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=snack+video+apk+iosPDF 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_off0000b157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB157 14244 bytes
SHA-256: 31fea00ea47226456a530a1294120ba952b9bf1a4799cc8cd53004bdcaaf18bf
font_01_sfnt_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 10496 bytes
SHA-256: 643d0231f7bb94cace03eb4b24eec4355197a17ff037c71025247fdb70e2cd58
font_02_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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