Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf524d3bb4941bb…

MALICIOUS

PDF

88.4 KB Created: 2021-09-05 02:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a3d88654972db7e2eb0ea431678204ad SHA-1: df0f5f39ff7306f49a54f822926e6a83ce704da9 SHA-256: fcf524d3bb4941bb659f7938315e0b1c6f576ee2cc48801581993a988740ce70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=t%C3%BCrk%C3%A7e+s%C3%B6zc%C3%BCk+t%C3%BCrleri+pdf PDF link annotation
    • http://anticacarsulaeborzoi.eu/userfiles/files/62622036781.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d21033df---38053081857.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/38253571797.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16092b5e8f2868---20355789231.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/bd71ad791789c9bd2f02f184fa9f7bd2/rujewet.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/40378783470.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/domugutoj.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/tutul.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bde2f2d964b2a2a28500d15d16321ef6/74249891032.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/zefewapetipej.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d70fadb0093---37872996331.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaeb36481b---sagafezowitum.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/fokevelabe.pdfIn PDF document text
    • http://teknis.it/userfiles/files/fuzawosefiwazidixerugubor.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/16468798945.pdfIn PDF document text
    • https://eventaipei.com/upload/files/konuvevezopitege.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c03ecc5ecca---gexulusexa.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/17522803647.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/mikokasuget.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/ap5kdsumuu0umuiq916r608e1s/levivimarewijevimenodaza.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/nurebogeki.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/70346255684.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ac8c9ad73---70988976811.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/21039753401.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53dad411d0---tiduzanitokuxepa.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_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 19224 bytes
SHA-256: 669b4a2ea0e8d2242aed70144f20e289b8ed072d786181a94f86be3a99fad0e8
font_02_sfnt_off000138e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E0 10948 bytes
SHA-256: 68c3917380c9ac265aa0542e317f80da3ea730c3d7fb50636676d46f77a75c63