Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2de78cd78b73bff…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 14:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07bafbe14e48314fb56ac056fb6aa4f9 SHA-1: e7d60897a82f8bed9d6e6063b67a9c3f7c410873 SHA-256: e2de78cd78b73bff08f1b5581f942ebda9cd55c7721897b7024c9ed8444862bc
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised websites, acting as a link farm. Heuristics indicate these links are used for SEO poisoning and point to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a423dfe8bc7---28713574230.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9kc1oj4iv09qljt2tvbldhvv45/22089010346.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5094n9rv057s2io97mi7k1cs10/filejepulixazir.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/lovasinibo.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/uqlf8j1ni36pa99sg990kqqb51/zusativutelezojotozifafo.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/nezewomesabiwujuj.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/26847009772.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161045780cbeb1---78294536536.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/jarigajegupena.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/vumuguxuw.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210627090101.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/40101640908.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/gimavolukok.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fbat5qb1vfuoqbquk961tp65m8/galudoxuxapib.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/6b78f450196f037eacd6b86dc7cc6d23/36084660707.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/korenemefakuzimulan.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ba990dca1---bobabomuve.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/muzagu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16092c1938a820---41392259044.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/zunepebozibidewamin.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075581360e83---47719288535.pdfIn PDF document text
    • https://lecachet.fr/docs/files/61274521182.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/27044334424.pdfIn PDF document text
    • http://statenbracy.com/clients/d/d3/d362857cea7b6c304c7898dd6c6993b3/File/sogugofomaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=trabalho+e+energia+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD721 22080 bytes
SHA-256: 99c4337790fdf9e0b5d6e50b126eeb16dad47402aec0cc52b5dc37efa7b3f5eb
font_01_sfnt_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 10616 bytes
SHA-256: a03d5bf7676a8b3d9af403b429f8f03d8dc75e96ec0baeb8f59a111ad7610aca
font_02_sfnt_off00012660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1