Malicious PDF — malware analysis report

Static analysis result for SHA-256 15fc856f6ff82822…

MALICIOUS

PDF

94.5 KB Created: 2021-09-11 02:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8171a2868fda527700ebbe3f496c56bd SHA-1: 4c628c98a60f07c8268b6b3372ef5336982481a8 SHA-256: 15fc856f6ff828228bc74ac3c14c8574efd5a7f8a3eb604e038e101ddbfcfb79
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613905a97d3ed---kajolemukifadonuki.pdf In PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/cc7f3e1d08d0379a99ec66a5bb590c5a/jinusixegoredukojuga.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/78131267826.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///nitetabul.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/gefamexufufemadi.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/vexekijaj.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139f6c10954c---vuvuk.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/xazezijosakevivejeka.pdfIn PDF document text
    • https://noddy.nu/images/file/13283247221.pdfIn PDF document text
    • http://skisun.it/userfiles/files/zunudeweredibasezoxadekof.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109051117032999.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/temorumutezuxinifobulo.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/9446514643.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/dazamuw.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/mugusavibope.pdfIn PDF document text
    • https://gdaniec.com/upload/files/wopudinaxi.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/kureridel.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/zesomakilupopesiboni.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/mivometilibakupejaw.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/94846079040.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/23246033018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=reset+lock+screen+password+android+device+managerPDF 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_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 18392 bytes
SHA-256: 697a03422fec855aba19193f1f32eef0b00b3a4119b73be56b55bb23244fe618
font_02_sfnt_off000151e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E6 11148 bytes
SHA-256: 3a011ed559678935507917bc77daa445a86af7cb6e8ea0f5d1466b3ca8e0c0f4

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