Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6710cd603602af…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 07:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 36826e7bb4124797496e598238b55b4e SHA-1: 5dacf2ba2fd6eaf21ae586f518ff3b5445e99709 SHA-256: dd6710cd603602afb1aea78c1a0381d2224a6ccb88f38ee2f6ce59343e176d3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially malicious PDF files hosted on disposable domains. The presence of external URIs and link farms suggests an attempt to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://ketchas.ru/uplcv?utm_term=immanuel+kant+biography+pdf PDF link annotation
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2c865e87f4d2772e73cb0db52c98870a/vujavifow.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/tutagabufuvivafot.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb83b3920a---nejasugamomibegaw.pdfIn PDF document text
    • https://besi.co/ckfinder/userfiles/files/maludarotufirezikakuwixi.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/juxotodudaravovudenaz.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/patajalotegup.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/nuzufesopakusigosadu.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210730_053400.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072c283f0d4d---3636044890.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/92112028195.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/93005210644.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/21737071586.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/94682066440.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/39944218324.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/76887149038.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/94467724380.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/796426ccde8d49259726bbed468213d1/81806731210.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210730025533_1226618174.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/bazax.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/415005204.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bacb82094---dojisa.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89305ada0b---gixileneli.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052510381950.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/xazekurad.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/rikefaw.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_off0000bf37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF37 11172 bytes
SHA-256: 3abe2e1624b1de562cfc78119f129b500c6f51971fa438076e5fc3a2c740575d
font_01_sfnt_off0000d8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 17716 bytes
SHA-256: 59c5dc6f79a5a4b448e6188bae743c52f99aa54db1a449a3bfbf0284a8f5f1f9
font_02_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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