Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ddc92523038efa…

MALICIOUS

PDF

78.6 KB Created: 2021-10-08 09:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 767439c0e4d6b8789841f246d6a6e5b4 SHA-1: ab95b3ff89e7753f49f63a137f43a580a0b45ae2 SHA-256: 15ddc92523038efad6c239c5d93abaa329d4a432be2590e4158082003b47e81b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=what+is+most+reactive+metal PDF link annotation
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/masunagofivu.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/telugagofir.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/15342286415.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/1f092df8a5e26c0b972f2a6d49ee0bc1/kujojunejizudijubijunuwaj.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/42732929846.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/74310691190.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/siwezem.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/94819606729.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/vizakedudodoluxojanozex.pdfIn PDF document text
    • http://poiskvod.ru/images/file/paxujomokunijemer.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/92042386292.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/90816927640.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/47003320325.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/lugobunepipunaguw.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/28358811896.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/vevurad.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/41880882501.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/zubapevixuximosufomazev.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/pawob.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/05284608e45de2af8969d7525486af44/tevexarubipamabovi.pdfIn PDF document text
    • http://na3.it/misc/file/vibuperozileze.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161440b90d70d2---64098685030.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_off0000cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB8 19224 bytes
SHA-256: a320bd9e87b29360c7c9ec2a965881e8dbde5e07a136aa5252af17d74a03bccc
font_01_sfnt_off0000fcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD1 10448 bytes
SHA-256: fa12a220a54d9f73167cf2b6100f0bf0a768e269c24937e478c171fecd17e8fa
font_02_sfnt_off00011497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1