Malicious PDF — malware analysis report

Static analysis result for SHA-256 8075faa3aaf0b77f…

MALICIOUS

PDF

94.4 KB Created: 2021-08-03 05:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 52ce1713152fdd2c02a74f3f08063df3 SHA-1: ef038aa664e0716b8fa784d5d243b8934da4df4c SHA-256: 8075faa3aaf0b77f089d36a6b8bd1ea546a66b940a15fd047b321d75041f9d88
236 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a fake CAPTCHA lure and a payment redirection lure. The ML classifier strongly flagged the document as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to trick users into visiting malicious sites, potentially for phishing or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/9002499185.pdf In PDF document text
    • http://1utilaje.ro/mm/file/relagowuvow.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/15134407818.pdfIn PDF document text
    • http://stasta.com/userfiles/file/sisadesemu.pdfIn PDF document text
    • http://usa-ex.com/images/blog//file/27017925389.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/bibudidosomarexumoke.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb77b9d3e62---26340211232.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/zufomudufil.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/kijurizalileve.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607032deee3fe---84891350401.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095b5952103c---ruxegusalomizaje.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/95703687775.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/10833293853.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b485a6f70---tudobenisaxaxeva.pdfIn PDF document text
    • http://change4best.ru/upload/file/towekisaxugemek.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092969382f89---tokifumofaxutizun.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16096a70ca9cd9---99352270126.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6086821c03fd44fab3044e52472e0763/25852031159.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/u6s5vt2aas0grp5mjb4ipa2926/lozifemetig.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210622_8277B8C8196744CA.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/82066441662.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/tunikatuzakoni.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070120220490.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/pojolefafizul.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/i2166e43usoa48352vhdpi1lhh/fidofijazud.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/32577015868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=outlook+2010+cannot+connect+to+yahoo+mailPDF 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_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 10852 bytes
SHA-256: aa01ce4dfcdb157b040e32f302418c2035ff0658fb82bd960238cfb6b2b23f59
font_01_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 18296 bytes
SHA-256: ab42fe27840d64c8c4baa48697a8b5c6446c10fe0ebf268a9d519f9cd15a57e0
font_02_sfnt_off000152e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1