Malicious PDF — malware analysis report

Static analysis result for SHA-256 687815f1d5946a13…

MALICIOUS

PDF

73.6 KB Created: 2021-10-07 10:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 393db61492d10239e0cf220d378a9685 SHA-1: a3d3297a390f3544d8057e0fe9975f2ea02350a8 SHA-256: 687815f1d5946a138ebac6524e8ff2b950e39c86adb34d5fc3a267d60af74641
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=foreign+policy+theories+actors+cases+pdf PDF link annotation
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16155950b4c9c5---80166613929.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/64961651537.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/95064825869.pdfIn PDF document text
    • https://logcabininn.me/nbloom/fckuploads/file/rulidus.pdfIn PDF document text
    • http://eecca.stocker-development.com/uploads/ckfinder/files/57261667949.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/ludoruginamosafogivod.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/1889172391.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f71764c14bfac389efbda24ed2dce183/15644613597.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/96802828332.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/85378593886.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/7uckbpuu2jk138iqe0ptackh65/karixagikomamamopurajavo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614475dbd020b---mibagofewefeluninumovi.pdfIn PDF document text
    • http://tyextractor.com/d/files/55525297289.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210928/file/16328632661156.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/vuzopujof.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/57559597446.pdfIn PDF document text
    • http://ahppesticide.com/userfiles/file/xuziwudiw.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/kixenexok.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/zarisejuxazutawozajemibu.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/14628549274.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/giremewebatukizow.pdfIn PDF document text
    • http://pbpharm.com/upload/files/78515595642.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/bavaro.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_off0000bd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD08 10988 bytes
SHA-256: e364a73e1d4682e408b8d360096a6c28da66bd45cad946b715e4f75da640ee13
font_01_sfnt_off0000d64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 16360 bytes
SHA-256: 406f45244b97641be125bf93c75ae7fd66db465940432676b2468a00d46e652d

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