Malicious PDF — malware analysis report

Static analysis result for SHA-256 d508f05e9d42c099…

MALICIOUS

PDF

82.5 KB Created: 2021-08-18 21:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 387590e21f92fbeebc010ba14822de68 SHA-1: 2e11f1b77b0d96788cbaba60397288baa4d93b40 SHA-256: d508f05e9d42c0997a4b08b778207f821dcc09e17e4dd17a59f136756194f07a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://cructi.ru/uplcv?utm_term=microsoft+t-sql+tutorial+pdf PDF link annotation
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7f83b15f---97097972005.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/1598e922dde885417a47f42f350551ad/suluvova.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/78539927420.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160818ff847e77---5418586998.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/22976246626.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/bewew.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/41077428340.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/14/63670441454.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/8effeef41253e191f3d9032b2b71fdb6/61871251961.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18e52acdc---rokodusemirametupolefakoz.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161156b508e94c---35365019398.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f118217b---59778477218.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093162c0a27e---putego.pdfIn PDF document text
    • https://taperagi.com/contents//files/58838481554.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/8dsl21dmf53f8jc0fdmmk5f6oi/11321656907.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/jebamunaxuzarububena.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/jadofowopubikaxajozoz.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/penoxovenavalisiduda.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b58b65934a---mixigixisinavov.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/57806046601.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/wulonaniwifilelexob.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/el7qrl68g3u0g3pvj53eougbrd/83791264913.pdfIn PDF document text
    • http://abpaluso.com/upload/file/wojixonosor.pdfIn PDF document text
    • http://teraval.cz/res/file/13623769113.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/lobajasim.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/80695105158.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_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 10648 bytes
SHA-256: a0044e0f69a4f7f02b45ec680ffa90d68c3eaeb2eb2b58e261319e178a320261
font_01_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 16680 bytes
SHA-256: e82d3af0ac5dbe09e1413804f35ac66f527c272cd3a21746cc074529ca4de3b0
font_02_sfnt_off0001239a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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