Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28feb268bdef18f…

MALICIOUS

PDF

78.4 KB Created: 2021-08-08 00:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 79103a50be9173277de23c46f9d90b74 SHA-1: 8cdea20b89783ba925e23cd65e34f76ac16fb2f3 SHA-256: d28feb268bdef18f7451530c42f8eb1f311102741723ecba22ac480d8ef9e98e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to external malicious URLs, likely for phishing or further malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://sicurezzaips.it/uploads/file/76386011897.pdf In PDF document text
    • http://studiopetrilli.it/userfiles/files/3558626769.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/83507019135.pdfIn PDF document text
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/veloramujawejad.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16076928bbce9e---retuvuzowuwofimowe.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/fikasiwuxabozeber.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1662ac0a---gavod.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/jaxume.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/e92da6145089a175cf281df99c637163/57565359842.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/94646773066.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/90038822823.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/0klgdq9jf5hf7fkecasakaa847/nogonem.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af90b38c02d---rekisivu.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/9g10v0mqqutsshu5q6fdi9k9r7/fajorupofomi.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/laneg.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/6bcmph5d2set4c7ggtu7ru7kc5/pawekixisolunijimexunenub.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b9681718b76ef6ce11f208baa29d197a/sipopalejogig.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tdhb9dj9u06gg0ks10vs2jr370/4732463331.pdfIn PDF document text
    • https://scriptdd.com/_file/file/22223300042.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/kmfh505qql5rmkhtuou88scg6u/96412195606.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/42295940847.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/rgup3u3srl34s0477trf19kud3/foxusalu.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/zobepizubap.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/25445096682.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/wagokukesegegutowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=driver+para+impresora+bematech+lr2000PDF 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_off0000c960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 10984 bytes
SHA-256: 10aea64533a4a0eeaeb83a4e699fe3b8de31fec921ac3bf6e48dd518641e8a79
font_02_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 18532 bytes
SHA-256: 3a564c16df56287daea010da88f519d1b192a085a8bae49dea3ca47840999340