Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcfd80c2eb474ef…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 07:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a0359fa4c7699f152a0a46d86ecc4d5 SHA-1: f24e09c0b7afbce021003df8af3f913f0b4045c5 SHA-256: cfcfd80c2eb474ef019b185ed9e0997b2f879c566e8641fb6f57ed8d27cd7e1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=echo+recorder+for+android PDF link annotation
    • https://apoiotelecom.com/imagens/img_fckeditor/file/gunonimokudonubep.pdfIn PDF document text
    • https://kawanmto.com/contents/files/5566543089.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/metajazulumijux.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/kazezatijekinofo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132798605cc5---84601725304.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/rivulewaliwilomavodetozi.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/22105123563.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/likixozopojizupugirumavo.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/78092733783.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/guxosuvutipuf.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/53020215462.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c717871ef8---6302971758.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/zurekojozosamevaro.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/fumedomuluk.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/41688036335.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/44626784625.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/99798880044.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/bdf3ef2ae087faa687eb64f7c6712182/vazej.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/narok.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/turegibokuturus.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a469558b1731aed6c5fcdea29044d958/gagosezulafupogewu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c64185f66c0105a9e979a6d99ee92556/majuvobevobex.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/foremavidatufuxot.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aede576e3---diferilewelakuxon.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_off0000d946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD946 18044 bytes
SHA-256: 6995bae051742e849e98aaa3b73370f8a4d7af3c5f405f29e9a1ca18e2c3e292
font_01_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001207e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207E 10244 bytes
SHA-256: c91f901ea13015d61b7e65c91ce42156bfca6813c16d5f8c64da553b8236ae34

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