Malicious PDF — malware analysis report

Static analysis result for SHA-256 a141d343a2543757…

MALICIOUS

PDF

189.9 KB Created: 2021-07-07 12:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cecacbed5920a56b449f6c7c114deacd SHA-1: 712782b881747fcd01d04620dd604c9c188b28e2 SHA-256: a141d343a2543757e537a635085a45766070fdcadfa93bef1c15aff93fd7d514
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many external URIs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9631

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.bandungmesin.com/file/38127093844.pdf In PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dc91168f9---xasut.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078ad696904c---14769346685.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802eb2b6d6a---firakodaborafekixaxubut.pdfIn PDF document text
    • http://congtyvima.com/images/Download/14077099756.pdfIn PDF document text
    • http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/52726080975.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/177eacb8d8aedd3f50bd9af5ae63a84b/68382855262.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098db6e4ccce---38119262612.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/obpur96rifp7kgftjdqporjfrj/66815451703.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/jomikokojeba.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/28091625156.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/3dec0c842011fc66083d6f6478e838a4/fopimite.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/13771419837.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898be0ce8e7---26835536745.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/5933614803.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813a2a9f330---87569537150.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/1ef2671ed5885e9ea174ffc2617f4547/nijupibuvegeguvuboba.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5acf9508e---pusudaz.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/bbae05591d4fdc7f4069f6e10c7eee80/38113580046.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/91700857905.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/72565c715e366858070faad52a46beef/21019298998.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7ab2055a---wolidikod.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/rezizi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae06500196a---93395589270.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/a018676a20f56473bb8a7a0e80a32df1/61798531961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=surah+for+protection+from+harmPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0002abab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2ABAB 34904 bytes
SHA-256: c531592878fdbeed8adfc8e5b2ad2e8311c6990608275dafe85937cad943877a
font_00_sfnt_off00024e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24E22 10708 bytes
SHA-256: e404cf5906fc08b6722f7f2e937a78ca2ee67b4c40aa8a350ea090733d3738aa
font_01_sfnt_off00026683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26683 17328 bytes
SHA-256: d66d72de4bcfde66aa19e260ddf7a7c5cd3c39c42016ead3c72c9243e60a2c2d
font_02_sfnt_off0002939a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2939A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.