Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6f2e2cfd754521…

MALICIOUS

PDF

71.3 KB Created: 2021-09-18 02:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4d10e54333c5d420caf60bc9b0cd2fb SHA-1: c8d89e113b384ca0cd82ab5674ce3a7ec78f3aa9 SHA-256: 9b6f2e2cfd754521d4e537d15100dcde15ad75c7bb4d20aa3903552defbbafd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these URLs and the heuristic findings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=how+to+make+a+video+home+screen PDF link annotation
    • http://eg-connect.com/uploads/editorfiles/file///wufororozidomozewo.pdfIn PDF document text
    • https://bfull.ru/uploads/files/60414190352.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/85777433777.pdfIn PDF document text
    • http://smogy.ru/files/files/29389386572.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/vosikewivuxutigani.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/65078875849.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/vejijurobuf.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/wajaga.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613337af85b3a---gajuwomuvuwitaresugu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133a60075db5---jiludetamapabokiri.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/fugug.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/zadobesebezesitifujezaj.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/xavigiz.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/nuzikijegaw.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/89003331206.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210914_A413E149AF5270A9.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/datalufuje.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/gikigagesajotopa.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401dde1736d---51176286780.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/danuf.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/jekixawulekip.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/morusobigivegiluvakaban.pdfIn PDF document text
    • https://ebooksweb.net/files/file/sodoviguzelek.pdfIn PDF document text
    • http://elpijisystem.com/file/69044510764.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E2 10824 bytes
SHA-256: 83467e34de9e430cd7f1f581beae60b267f2d31004bbe93937da6fc881ec8603
font_01_sfnt_off0000cfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 15692 bytes
SHA-256: 1e775b28a94aad20164fd1daa26eae98804cb2e6ac6b89f009c514f960635b0b

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