Malicious PDF — malware analysis report

Static analysis result for SHA-256 88cc8b4456249d98…

MALICIOUS

PDF

84.9 KB Created: 2021-08-16 11:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a754701db5f3a4b5076dccc344b1837e SHA-1: e1302b646fc88d9fc646a8e8627546c5a1de79d4 SHA-256: 88cc8b4456249d9831d58ebf7c7827ab0e10376c19a2e282858b2a46c75cf91a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a link farm used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/f22991ee2950ce74e0d63eac9ec1aef0/93553357582.pdf In PDF document text
    • http://lasfyy.com/uploadfile/file/20210616233112783.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/8b6dd277c408a258f22ddfa69edfe8e5/lisezukeraroporakavatuka.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/22719920173.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/wubegukuluf.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/cue9q2aqsvmsgnjkg2d2nade62/mimekubewigijulirulisi.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075287668626---xunesojukerejusurix.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/vuzibefulukoti.pdfIn PDF document text
    • http://healthywithhart.com/res/file/11152560358.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/nufibepajejefenazufezi.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210807_223412.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/33fa96fc0506236b9489bb77f0e5aac5/94420079806.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/91049740781.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210725_0A437CC2FDBEFA49.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/zarenibuwasabejulojamotez.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b618a4cac846f7542f7a57ad3558fd38/wezadalibawalox.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3048cc7fee8f28557aed6ee9b6a36917/65293079315.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094b57c200b3---75397077066.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/22629896826.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbb9a9415---redovore.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/88209065848.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/97740978168.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/9533229364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=exerc%C3%ADcios+escalas+termom%C3%A9tricas+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_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 19132 bytes
SHA-256: f63a32f98049a2a4a746e439a52e27438c14c4f55227c006e0a0d13e2ea991ae
font_01_sfnt_off000111f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F2 10976 bytes
SHA-256: 71dece3219fc662ba2de794bdbcb05fc1cb32d818330314eb9cac7b258fe42fc
font_02_sfnt_off00012b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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