Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44fc281903eec77…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 22:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8c7e2c71fe403112c2a37439cd861b66 SHA-1: cc573c10d0a0cf88d4e639e02854b2d3d6bc2a87 SHA-256: a44fc281903eec7799f3fe7d03c7bb0be5fd0c11703dd7375bc102f39c94c879
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous websites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of external URIs and link farm structures suggests an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the overall structure and heuristic firings indicate a malicious intent to manipulate user navigation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/0u0jvmnu13k888a6oh16sh25ts/27663762704.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/333ca770ebfca63a3434dd001d45ba57/87738531474.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/69832cd12c79196796577014c709c4a7/bosukepobidawidonu.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/66436976181.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/75620682513.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/31887535231.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/11955454215.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c92f5424a49---85451834713.pdfIn PDF document text
    • http://halaljones.com/uploads/files/vaxujusixizufinepujova.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/18456539936.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607591f703167---22084801255.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/32137786255.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/tegipabuwibitulesegal.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/jitebanowesokesu.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/85444967741.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/17756678819.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/bimezerotiwiluvebe.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/dudetajijomigovogodaz.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/7919aa1588ddd2dfc522d2bfd28c4a03/38522125407.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bf42187f49f---fagixawiz.pdfIn PDF document text
    • http://iucecb.com/files/file/muxil.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/27fa01c863ecb5bc375d73d7712b48d7/89076896125.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/79300402552.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ab1d1dbb7---dafunorivelurajeze.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210617175559_m3hatt.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/vivedobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dimensions+and+determinants+of+health+and+physical+education+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_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 11100 bytes
SHA-256: ac88cab1f624325c3fd5a2578a0db4367b18da40af4f7b7ef5a46576a587987f
font_01_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 16700 bytes
SHA-256: 064f06e96c1bac51e9212445dfd2af37b12253ef0b200778e9373c3f54b76aa7
font_02_sfnt_off00012b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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