Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e1291431e01fe68…

MALICIOUS

PDF

89.2 KB Created: 2021-09-24 11:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b58125dbc93f2b6452aa47c85ca4993c SHA-1: fd7d878538bad2c7cd699a73d96bb69146057733 SHA-256: 0e1291431e01fe68238a51b20c9c6db5134678671f3e78c2544cac95113dfa8b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, functioning as a link farm. The primary purpose appears to be directing users to external malicious sites, likely for phishing or malware distribution, leveraging the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=baaghi+3+full+movie+online+watch PDF link annotation
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a320469afa094a344eb25ead57b9dcf5/93423689427.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/97088390461.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/rejikiginerilulenukin.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/74494569336.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/70736588861.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/tijojole.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6693ba849c09168b9274071d96b74045/29118470834.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/duvakesapegurusug.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/xiranijejodozekegida.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/gidafawuremumojimozo.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/29278142756.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/gopevekawotofiwibuk.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b6233e894---41169083328.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f0965bc7bd750649b1ec59d59240dfb7/37299558066.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/todabusipaxerujujupiwu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137da9ad50fc---2653776184.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/37087309890ccf6e5bec28efa8e560ac/83544873853.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/nozikaloveputukeg.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/36679101199.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/8538474632.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/36360744765.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/89839221684.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_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 10992 bytes
SHA-256: 95dc065404ee4613d8057cf3ee2b89bc80eac656172f62a40c6c7e3c7e256725
font_01_sfnt_off000111e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FB 17596 bytes
SHA-256: 0a031d31edd794dc6e4e0b4cd5e5ae2a84681c8cfd85fd6f485ca5edf9ef0297

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