Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8e7f2c81195ce3…

MALICIOUS

PDF

88.2 KB Created: 2021-07-26 06:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 39d30cbec64429abb360756da020ea8a SHA-1: c1456f8684ca47c000ddd7ecc5e85949a8fdcc79 SHA-256: 1c8e7f2c81195ce3a88a192c3cadac2b9b7cad3144d6a958f7a687fedba56a39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted from this sample, but the presence of multiple external links indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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 http://www.sealjet.mn/pictures/files/51685645082.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b130926a4c3---59859954014.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a80f0aac3524e27bb5ac7ab4a845cdc5/rugizixirod.pdfIn PDF document text
    • https://cavalier-king-charles-spaniel.ch/userfiles/file/96841929399.pdfIn PDF document text
    • http://rc-modeller.se/images/file///ropemebajevokatomuto.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/a6ba7323ba9393004380539637f20302/lowizevaletusurilob.pdfIn PDF document text
    • https://lavineriablend.it/file/gofujururo.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accf51d18d9---joxutole.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/95iig7bjg75hdk3ts1muf5i690/dovizulesuke.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/gabukemimirosuweji.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/nuwirajudufibalepajidag.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91888bf29d---jorukakifigide.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607412b69d64c---valezujofixosof.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/d0163fcb64f8ba553f095535da6e0eeb/12967525896.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/53243719275.pdfIn PDF document text
    • http://klhl.com/userfiles/file/zuduluwosazetudugebafi.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/fvoh16ijojnison3jjcgg79361/lasepanepek.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a655525b8eb---lagagosememanizuvusawe.pdfIn PDF document text
    • https://synersys.fr/contenu/file/mevajujujonewoninuwujow.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/pisoxozizulisamezoroweji.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094de3b2c64b---83757690474.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6350c91cd8---34974483357.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/barikujapiziwidalefebaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=zong+new+sim+offer+codePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 10560 bytes
SHA-256: d628ee4a8cb3b67a645e29790d440fdd8ce8b044c01e294bc5e2b3d920b27364
font_01_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 17516 bytes
SHA-256: bed074464087ef106e429823f08dcec2bd8c30f1cba8c76418875122410c279d
font_02_sfnt_off00013aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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