Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4acc0ac4dab0bc8…

MALICIOUS

PDF

71.2 KB Created: 2021-09-06 13:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68248cf3e0d3585e1a034eaa249b6f1e SHA-1: 6e1a60a648e2f25a8be12aee8643b250099cce93 SHA-256: e4acc0ac4dab0bc8af1bfe6576292e857f390837a33ca09b67a44571b83e5601
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. These links are likely part of a phishing or malware distribution scheme, aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5c8d2285---32661015619.pdf In PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/73501465791.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/kamubatazinugobe.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/riduwugiduxemuwog.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/bakolumosojilolelulu.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/4c412cf446865c5c1b0a87e427049913/72182966066.pdfIn PDF document text
    • https://biocoils.com/img/file/ninidemarixudeb.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/81257705209.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/vajezorogozugumorobomuk.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86ea8d817---turunerogula.pdfIn PDF document text
    • http://mospolytech.ru/storage//files/revotozuruvazomunipalitu.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b24abc5c540---15477748031.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/medumazuredamonazax.pdfIn PDF document text
    • http://sns.hu/_user/file/95394900459.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/2298898922.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28956f0084---61561545100.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/97533840840.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124bd17e5088---51323830151.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/26853256604.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/jf344vboqne575488bii9m027o/35237938105.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d039dd709d---67847080000.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/94427545949.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/nudemudonodipabevomonubim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=advanced+english+quiz+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_off0000b766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 15488 bytes
SHA-256: 171f0af0b734b9eeb7f23159dd73b2c552a09fdae602f22e0c3ad8c9aede09a2
font_02_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 10932 bytes
SHA-256: caa6e686f2ad1c57592f9fa79af48c6fb63a732b6abe5bac03712bbb7a7e2095

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