Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ebec8724e23f42…

MALICIOUS

PDF

75.3 KB Created: 2021-06-14 19:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5cf002ce799af7647f62358b838538c9 SHA-1: 565ce276b7df2d90473bbd398289fc16888b2e1b SHA-256: 35ebec8724e23f425046a7f64e8287bf3677756adb530a14138e67b634b55e79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document uses a lure related to a popular show ('Abhiyum naanum full episode') to entice users. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=abhiyum+naanum+full+episode PDF link annotation
    • https://carlojans.com/cms/file/91426943611.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/16504183670.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/63651132706.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/oj9261in8k6k3m1atnef6bhtff/38941660986.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/96659247937.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/fb3ed0c47f4f7e78d701435589f8c874/62711125154.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/84842240325.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51589e777---nejuvetamediwiraroreg.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/finezezubobizovovapuvox.pdfIn PDF document text
    • https://afayl.com/userfiles/file/roruwudop.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/75681941412.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d270b4f06---22156796504.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/66905992221.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/67ce4d09ca2f2ff09a1c36d3aba368cf/miwasumosuduvev.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/9kd23aebue7schbooukeu5fuh2/53080202081.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62dfdb8acd---juxapifomeparododerije.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/sexevegibezopak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 5220 bytes
SHA-256: c3723a1c436b0b216946727e02af44812912db3bd2f3a922692678c71fc20eb8
font_01_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 10588 bytes
SHA-256: 0618590be7d5b2897f8e88fbfdd7a9995746f4321a52f7e1b82894bfe291b49e
font_02_sfnt_off000111fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c