Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1f09ba16c16e37…

MALICIOUS

PDF

71.5 KB Created: 2021-09-08 01:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5df8644a6169f248abccc492b435eee SHA-1: f032ae31da45fb4faa9d3f2ddc1be563b1656944 SHA-256: aa1f09ba16c16e37c95fcc5fa6499beb36746558ea029277acd4f61eb8a63e2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16109a955730ba---80952892262.pdf In PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/b7oakkdjt58pb8gts91kgehrgg/sibipubek.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/lapikimuliwapitiwilijo.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/4903745460de1e9bcb93a.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/winetapi.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f3146816ea22cb2b33ca0cb46787e66f/1377494262.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/qsqnmf41ou061paenpmmmqeaki/polejonujigaze.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611c2f34dd192---32769894151.pdfIn PDF document text
    • http://djpress.pl/Image/files/jazaxumunelezebirevo.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/tatoguxarapojose.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/94876429407.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/nalefebanomiperelekipop.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/60366293413.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/24124120370.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c871fe5ffee---99356185540.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d2f76765a86e65632b6bc724cf53733a/dosifu.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/28176708061.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/zalibufu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a7487898cb233c350db8cd47101d728e/59296127060.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/46724564629.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c55d07aa---59391578087.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/buforisexodufaj.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0a8cb2c32---56495911613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=merge+excel+workbooks+in+one+worksheetPDF 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_off0000b84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84B 15488 bytes
SHA-256: 2fc3eab3faace0989b4f658b7aa3e3df4e0182a28c918fe90b0ed900c3a90091
font_01_sfnt_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 10760 bytes
SHA-256: 341988769088216fdb5623367d85fc85f7ffd18ba09cedd312335bff80447784

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