Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b3c3c28f968679…

MALICIOUS

PDF

83.0 KB Created: 2021-09-22 14:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9f60c1056e82b1ac7f3f735d9297202 SHA-1: cdc2fa2f0946ee692c56bccd67920569d5f7a983 SHA-256: 96b3c3c28f968679a8097a2700bd957d0cd1c51f137d3165bf4c840f7c4734e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://catamma.ru/uplcv?utm_term=how+do+i+get+pictures+off+my+phone PDF link annotation
    • http://104408017.linker.tw/files/39869417849.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/69199434350.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee66b57655---xezixekutozasofuwaloxarel.pdfIn PDF document text
    • https://palet-school.com/files/files/50494480358.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/47684155011.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/lirapujepevalotegoxugoj.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/wulodonevurebud.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jt82vt9e9ioqgsebbcd20845v5/wumagubazeruwipalodudavum.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/30630016868.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/nipadukamu.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/bajezukofimoja.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/tukijemifevu.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/41598833525.pdfIn PDF document text
    • http://myphamasia.net/upload/files/nakuwinumugomunije.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/34755411996.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f63ea1007c---rikusigunagevapa.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/vuzozisokefo.pdfIn PDF document text
    • http://artdental.hu/editor_up/nevejeruje.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/wivoboduvoderisutel.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/75962112233.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/fuxurovoru.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/80192062001.pdfIn PDF document text
    • https://lordoptika.hu/files/files/49030636029.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_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 11152 bytes
SHA-256: 813c8b1d5c3d57e460090382c37684d8ed0c43c05c3028fde353ea0214459570
font_01_sfnt_off0000fa10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 17468 bytes
SHA-256: f36f98071ea2a845a3d81195b4767b2fed21f07d0014506b137dd2f8279c049c
font_02_sfnt_off000126b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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