Malicious PDF — malware analysis report

Static analysis result for SHA-256 69aa7b5315ea358b…

MALICIOUS

PDF

84.6 KB Created: 2021-06-29 14:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a684cb5f09d889d61cb21673665ab93c SHA-1: cec5d490dbde14c52ba4e79879c792e19ed47374 SHA-256: 69aa7b5315ea358b838772d7e870a8a681d962456f05f9876e8f06f126fc09ca
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1190 Exploit Public-Facing Application

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Notably, it includes an instruction to disable security software, a common tactic in phishing and malware delivery schemes. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://coretry.ru/uplcv?utm_term=how+to+download+bedrock+edition+on+pc+for+free PDF link annotation
    • http://dentherapia.hu/files/file/46146559489.pdfIn PDF document text
    • http://piecco.eu/upload/files/lagam.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e4c09a8e3cbaf308cad01841e7b08a30/93361029192.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/wupijoxubimurutevola.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/mc764v49icrgf4i4jtphbao0su/84428141587.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb4263d22---nuwuju.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c819d66fc6---95180020871.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/63473474643.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086a5876292f---xegoto.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/85657827346.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/mesetezobelewawesizup.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/5348787803.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d610cf8ef---xorusibojalotudawenoje.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/48307426734.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751462d4679---89956730980.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609257722b803---rewaguvilebelupoj.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/sugoburemeruxagapudezadu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738f3fbffa2---vodinudedomasureguvuka.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5e03d2f3---48364592163.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/556780456.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/936ra9sairmbr24fnnlhek75ah/murijilifagivolijapaw.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bfbc2e6fb---24483758814.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988ff676110---83329799842.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/25778002170.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76A 18832 bytes
SHA-256: 363f79953a060e754f403774e122a8b1ab48c3fb9ed641312ad5a241ebef5bd6
font_01_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 10756 bytes
SHA-256: 35db9bcddb2be046c3db596034aa7843fcbc0f9cfa3feaf621e480cfd91a6566
font_02_sfnt_off00012098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 2848 bytes
SHA-256: fa2163af55e477102aea26eb7de4ad03154c2fa7f080d6c654725f7d13cc0c50
font_03_sfnt_off00012c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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