Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7aa445b1a5c231d…

MALICIOUS

PDF

86.7 KB Created: 2021-09-21 03:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa266a822844970d91aa9a7e8894cdc7 SHA-1: 141308fc8e023d81a556045f839bd2eebb6146e6 SHA-256: e7aa445b1a5c231d22b07ef3a78c82a1d9242ef4d2e9c52c788203e6ca6341b7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=best+free+video+editing+software+for+windows+8 PDF link annotation
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/18049150566.pdfIn PDF document text
    • https://asiapharma.la/files/files/30852002383.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/34958013525.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/28620361271.pdfIn PDF document text
    • http://dsagco.com/Upload/file/wiwun.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/bewadu.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/25655624075.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/86413159411.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/88719613593.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412cfc1d862---28677763025.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/64746044344.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/54688910085.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/090916084950.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/libipizoguzadoxetani.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/0pkqjqnb9g1dmdl3asgub5381q/murivibenajorujuzumagoguw.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/olttjcmi4rcoet5afauaicqs3e/69989703818.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/20345510937.pdfIn PDF document text
    • http://computerdoki.hu/user/file/juzezufile.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210901165901.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/sixexativinudumevenevuz.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/3628253833.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/temokukuginidefixegiwisew.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_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 17540 bytes
SHA-256: c5ad18f02fe3a9e035486b2a45b6b9eabd5acac603a97d94ec62cd168b959511
font_01_sfnt_off00011ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA1 10896 bytes
SHA-256: 58ee9942ee8ab85e6e988aacde4b23499ac37f47943f7ec7a05a3611f164b49a
font_02_sfnt_off000134e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1