Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39b3399a5b316d3…

MALICIOUS

PDF

72.5 KB Created: 2021-09-07 22:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bcd0c71a7d9bbf2818b1c0daf9f6aae SHA-1: 182dfc6216bff3dd3821d7673bff8c3259e3a385 SHA-256: e39b3399a5b316d31ed8989da3b3504cf0a97da44940499e3e12a1beec338f34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to deliver a secondary payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/4479b738237d016139bd4dc678822785/nizirenal.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06a693370---xusoguxad.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c24522be15dcb7758ced974e8a636be3/potaribuvebidekuta.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/s8o2crqpp9urkv5v96ie238287/80150175996.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/nosomuxemegudu.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/88629975241.pdfIn PDF document text
    • https://vayoto.vn/userfiles/file/sogonoxuzupem.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/mepojatopusanolakukida.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/lelirixapoziwikowoxuvu.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/metal.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/51557985133.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/31220133435.pdfIn PDF document text
    • https://noddy.nu/images/file/fobasomeborimom.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8a3cc27c6acf613f613a6888ad282923/33843205082.pdfIn PDF document text
    • https://italvaping.com/file/rofubipatarovese.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/kamaj.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/4dc4bcc478d90466182dee863a0208ce/kavanufodesowev.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9cf8b2bf7---mamapetibenewifetamolax.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/mubovisemagod.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/50657612622.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/19941442730.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611f954f56362---23834628764.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/7802997441.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/pilegulob.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/76742890831.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/pavagujemamapubawifopaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=employee+job+satisfaction+questionnaire+questions+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_off0000bda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 11396 bytes
SHA-256: 3a4d840c96e1012900828d39b20be9ce44c2298f00f72bf8b6debd24c443c379
font_02_sfnt_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 14444 bytes
SHA-256: 1865084e985cc93766c7b7ecf831a84d8694fcc20711f342745932a43a702972

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