Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1cf5a9c128ba87…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 13:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7a340536de898b1a828c9013eb566f1 SHA-1: a7e72378a1319de69cc2fbe19e428573afc353fe SHA-256: cb1cf5a9c128ba87f6f8cb47ed97eb65dab547dee4c0eee77fe832d9070a2a4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The presence of numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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://bestofbucerias.com/upload/file/nelepebezojasone.pdf In PDF document text
    • http://zhengfutz.com/v15/Upload/file/20217141019577717.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb43a150178---zojojizurobujibut.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/matazaxuke.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac72dc3017a---70291470950.pdfIn PDF document text
    • http://aurora-c.jp/files/files/44904064970.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/25271581806.pdfIn PDF document text
    • https://digireg.cz/upload/mezedupifeduvefidovegon.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161095ee3615e6---95993839694.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/moverevofumi.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/badomaxozetulumirozi.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/vodigezaxe.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/f77d73b40f580b5e154caa470bf9c3a2/90797677246.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160855870ba162---ziviwuxin.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/kawababoturuteb.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/nufaxe.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9ffbd7f9c---1030785124.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1b3669d57---66348384254.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62d37b3d6d---82226223873.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210606014825467.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/lufuvebofofirizezakep.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72003c31fc---kadofamazanodibiwevas.pdfIn PDF document text
    • https://areicon.com/images/file/14179803681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=concepto+de+etica+segun+autores+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_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 10880 bytes
SHA-256: e222c68a6ea8f9317e8f9911e04336d09058a43e58a20734c40777456c57b7ef
font_01_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 18412 bytes
SHA-256: 0de435f257ec526be5c94542dc08455097900ab2cb0a5ca9ca18649f1584bfef

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