Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5cfc6cc2a9bf40…

MALICIOUS

PDF

93.7 KB Created: 2021-09-08 07:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8ed9e54733941c58a909c7c5c85ec69 SHA-1: 20fd4ed8d3af25bf581ddac9c6090fc899cad9ef SHA-256: 7e5cfc6cc2a9bf40b7a78bc8e63934581a89791dec1b5c547c2c25750c88f3ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains numerous links to external PDFs hosted on compromised websites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic further support the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/d0574a096fcc4fe7bf041424186bcb94/tipajiromep.pdf In PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f22a0202---97520496305.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/78356446219.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210625094513773399453.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160835c6c4d132---wazunafuje.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/lejunidofakuj.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081bd4a811ce---28253569964.pdfIn PDF document text
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/jivotinalupinovukutesav.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/98047843728.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/jukaxojesemolewemisuleg.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/86443857565.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/45814a53ca91f415d35406dfbad6bdb7/47577032630.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/tunamogalabanufuzu.pdfIn PDF document text
    • https://aashianarealty.com/file/86880853757.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/i6lur47tjepb46ehgprqeu732n/98512827021.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/p797ib8tl69230fqt52240a0tt/vikunuporas.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/11910504733.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/19e361e7f52fea7ce7003b649a040237/xoribebosesoka.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/14172488.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/m3ejqesc5ps68p9bi4e5pe75qo/61195209221.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/renijipilimemofo.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/279c989d36e74520bf5779d99800dd47/49988111028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=tally+erp+9+full+entries+pdfPDF 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_off00010922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 10716 bytes
SHA-256: 8530f553c2e01af5b5631e66ecd7b45a586d73ae4bb325dc9933dbf811e2c7b7
font_01_sfnt_off000121e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F9 18028 bytes
SHA-256: 248b3621e0dceda2c51350f21d9c10add5209806de0111b1227d4be002b58ab8