Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca87458833441ce…

MALICIOUS

PDF

88.6 KB Created: 2021-08-06 12:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d68f82a21559b2a570e9d45c80be0f20 SHA-1: 0f4b3f852cd81b6e4577716d8aceac67a6a3b05f SHA-256: aca87458833441ce10df9c68e507a59ccb6ca4c0d2444145d9d81177c23ea79b
204 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm and displays a fake CAPTCHA to trick users into downloading files or proceeding with a malicious workflow. Several URLs were extracted, pointing to potentially compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=how+to+play+gta+5+without+verification PDF link annotation
    • http://ohana1bbq.com/uploads/files/24573122799.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608045095c5f4---bozokobutetaw.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/734ef6c01ae1d85e9c7b7f64db0fdba7/86522591518.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/unecuiflqpbk0m7bfej6ba9abm/27643277538.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/45003363412.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/kibiginozelebuse.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5ef21ed02---69153020141.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/pubegoxopomenoxonusezijo.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/46981635990.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/mafosasigep.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160fe75fcaf3e1---wimuzugeb.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/28595109678.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/3374747c62f4e38c845f136636ec8c11/zoduvakaselusonuke.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gajumol.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/c5be537ca5a8b793af3b5267e0d8e9eb/7013402195.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ee07ddd6e---92966386424.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c10c8cf2f40---lawokekeguluvesuxuxevazi.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/29aa90ea2bc9ec79db6c310c97f63b28/vobogekolirelesibog.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/84035991515.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/8261348455.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/14737452319.pdfIn PDF document text
    • http://fitviewer.de/files/file/loteritaweguzer.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/tojewedevurajun.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/28011977552.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bdea828b2---bisinawulirawabak.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_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 17352 bytes
SHA-256: 998d09b306e25da88a7139aaa1db1a8398eed408c14f95239027006fbaf3feca
font_01_sfnt_off00012206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1D 11080 bytes
SHA-256: 595b8d69a517eba6953faf3f9c798cf1733945c3318651131d3fa9c71a0890e1

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