Malicious PDF — malware analysis report

Static analysis result for SHA-256 5691aa5086c0d4ba…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 04:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7927b6cd43ea7937e947ef9db8d2c0f9 SHA-1: e3b33c8d7dcdfd3a9000d3e008d25adabd73fb51 SHA-256: 5691aa5086c0d4ba9170dedceb1f77ff1ef2f760571f27613b5ebfcf0849fe90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate the PDF acts as a link farm, with many URLs pointing to potentially compromised or disposable hosting. ClamAV also detected this file as Pdf.Phishing.Trojan, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hediyelikhanem.com/calisma2/files/uploads/95620477743.pdf In PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/91502296630.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/gidexudazusedim.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-9/20210909192325239908.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/tatosato.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/66759641545.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442c6be5cde---52821154241.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/zanafewozibatirejorobenez.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/xibiwibepob.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/kimov.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/kelubat.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/punige.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/78733488131.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efb11cffce---95329056446.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/68078502204.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/44354355298.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c02604891---82333917483.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/84535001682.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/vojijopuzakamakapepeb.pdfIn PDF document text
    • http://moneymaker-gold.de/files/34586010277.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/97140861880.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/77068251457.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/wovokidunozejosumesipe.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/28436208622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=jean+paul+sartre+no+exit+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_off0000b245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB245 14428 bytes
SHA-256: 71eebd1749ae677c7c7b9ac648ce01fce38a3963ec84182673565c58c52e0d79
font_01_sfnt_off0000d639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD639 10684 bytes
SHA-256: 3f4d29779cc160d9031333080cdf33ee9a555305dca626e34d1714975eec4d9d
font_02_sfnt_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1