Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1cd38172dded907…

MALICIOUS

PDF

88.9 KB Created: 2021-08-31 11:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06b12066ff83d65fd5f90b896f860506 SHA-1: 428be693aa1e11d9561faf889edd9d508821a4ba SHA-256: e1cd38172dded907ee2207b7aa8f9bad1c4e0dcb8c69e1b4553870dfa8c6fa4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The document body was heavily obfuscated and unreadable, providing no direct content clues.

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://nusantarabet4d1.com/contents//files/ruxozamatonezubu.pdf In PDF document text
    • http://prime42.ru/userfiles/files/tupaverakeviw.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/bipajojegixupop.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/mazaza.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/lekifimigosegepidejojube.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b26d8fb61e4---bapemulifug.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/277b6d26efe1643b4be8167e7bfd54e6/puvafoj.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/82693349837.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/zepofapuletiduxapejuk.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/60168331562.pdfIn PDF document text
    • http://89928386.com/uploads/files/202108171921467331.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/o3qu2gsepla71gd1t6jfc5v5jj/wuzorerena.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/58599936003.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b04371a5c5e---kiresida.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f3869900---6097170803.pdfIn PDF document text
    • http://retailcop.ca/files/31642881181.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d1d04b3f5---18919244598.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/mifofisa.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739aef6661b---91495184271.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/07cde222508923eaca9923c292a6f4e5/visadako.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721fe283e4e---77473879721.pdfIn PDF document text
    • http://thaide.org/userfiles/file/62411827140.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/95447846145.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/7194d7ebcc161d312fe2b0b6a7211532/lewubasiburevivorimosiva.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/rusowozozimonidekirelezes.pdfIn PDF document text
    • http://hanleyresources.com/images/63203268070.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608452e805f2d---magegamijalofegedakasijav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gmrs+repeaters+mapPDF 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_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 10092 bytes
SHA-256: 88e386bd66be95268b2a1e3ab28f81910d3a2333d10afdf63c1c71d4a3a6d65f
font_02_sfnt_off00011a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A74 22804 bytes
SHA-256: af8dc34d7b717bbb9244bf777d54ac58855536aaf1c4be6739c4f21c86030e6c

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