Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52cae33020ef255…

MALICIOUS

PDF

106.6 KB Created: 2021-09-04 00:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 349a9f20b0ae5461e164b266797281a6 SHA-1: 7efdb54d59b256b4720a0835d2c548a990f99538 SHA-256: d52cae33020ef255e8899f20d4386ff922835a91a9026eaebd981bff25493d96
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to various domains, including those identified as compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis suggest the PDF's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=aprender+a+aprender+tecnicas+de+estudio+oceano+pdf PDF link annotation
    • https://abugfreemind.com/userfiles/file/mukilizine.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/sorizu.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/waduxi.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/xaragil.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/958430215.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/xigizononisaditosagad.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/191658323321.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/48793729751.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/38cfa6edafac21ecc4d563f7ca6983ae/fesatozovipejudep.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab63a74d16---22129034531.pdfIn PDF document text
    • https://remini.hu/userfiles/file/vuzezosuremapoj.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/61264997275.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f879ed8c57---vibepus.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fbee19a65---82493152825.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/32145482209.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/22163402289.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c119fa8d38d---sixisevo.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/bainp81j76r7hal4bslojomt21/gozewifubaxobi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e2fd81e7c---25175900075.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64ef527bbc---64983503140.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/gagat.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/43733604355.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_off00013821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13821 10648 bytes
SHA-256: 003aef38f9c237da40e49af698158d41b2673268a7a0ef26f3eeeb00fefddaaa
font_01_sfnt_off000150a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A7 19880 bytes
SHA-256: 638d5a913323eddb1457a393d5a4997c376083d9d82831886d803c5edf2970c3
font_02_sfnt_off00018283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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