Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ca4b30eebf35ce…

MALICIOUS

PDF

101.6 KB Created: 2021-09-19 17:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 453931f23ed24d6fb164a67b46da8af8 SHA-1: c08512e9d51759ab576eac69f4f2bc72b533bab8 SHA-256: 08ca4b30eebf35ce2917cd05aa674f4b1b09c36e586c0804a4d9afc00762cfb4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The presence of a 'download button' lure and instructions for a password-protected archive suggest the document is designed to trick the user into downloading a secondary malicious payload. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, further support this phishing and payload delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://losaltos.com/wysiwygfiles/file/19451326356.pdf In PDF document text
    • https://orangcar.com/app/webroot/upload/files/tevidupikizuju.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/63959497844.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/55810808106.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/wudowisujarowu.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/jasit.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/c8d6e6aee8665083e12829ca28a63c6d/vinozudazuvokonetotin.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d48fb8ae57afca2c3936077868567348/97555241827.pdfIn PDF document text
    • http://epmachine.ru/d/files/50300108398.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/10799747818.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/16842629241.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/doxogokexiladopodek.pdfIn PDF document text
    • http://guitarenko.fr/img/files/92284557158.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/66051249885.pdfIn PDF document text
    • https://stopserv.ru/files/file/jolef.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/cc7ef6ef17c8ab5ceb383dab3e8b70d4/9874447704.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/39598659793.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/25367560255.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109121436391938.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/vodosufewavafogo.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/27652588955.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/71036839367.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/buwag.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/47358866274.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/60904633257.pdfIn PDF document text
    • https://kaparatt.com/images/File/89029254513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=windows+loader+windows+7+ultimate+x64PDF 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_off00012222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12222 10988 bytes
SHA-256: 320b23fe1e220158976ed29d2b38f778aae12c59898cf05395abe3e9473e1486
font_01_sfnt_off00013bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCC 20036 bytes
SHA-256: ff78cff409e264c4c9de145a7d8bca2b24bd429621d3fe40a4c3e94cb6b3f61c
font_02_sfnt_off00017014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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