Malicious PDF — malware analysis report

Static analysis result for SHA-256 87085d308e8045a8…

MALICIOUS

PDF

86.2 KB Created: 2021-09-03 04:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8dd8c74b97b8ce15932f890fd856ae6f SHA-1: ce8f10663ce8e779388c1be8085a230ebc71292b SHA-256: 87085d308e8045a8f74b2875b46d29ffbd3da02faf899301d6f52288f570bdb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure itself is also noted as having duplicate object bodies, which can be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://harmonie-avion.fr/actualite/files/52677969235.pdf In PDF document text
    • http://ty-universe.com/image/files/20210716_095614.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/kisoz.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/vojubabolizobalit.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160877d7bd3f66---56003662820.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160782b6bc8b7c---ledafovukegebemawugakido.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d199f14fae9---35778116425.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/75042624112.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/50927295518.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/22660748979.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/pqdoh573jg1otba40vkhdb04d3/zukixabebutapusuki.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/3392880304.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/44599364317.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a03425256fa---lasudifapexi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3d911f53861e3a2a4884eb2d73f57965/retuzow.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/veturinexili.pdfIn PDF document text
    • https://tckontrola.hr/files/98075685632.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/affab0dbfe166fdd82d7cd97545db8ad/koperedodabomef.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/tuporafadimotixo.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/67f265450cbc4eeb9dcd437e86397abe/libivizidivimobamajakeve.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/3eb2qvrc432kt4jdsg1jasvstu/nirosugakuruliniguki.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/63217783919.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/56076249859.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/tidod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=vicente+avella+bridal+march+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_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 18444 bytes
SHA-256: b1dde484f8ffbc4ecc1a69758b2aa470849101f5a4d709960997d17b977597cc
font_01_sfnt_off00011ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 10772 bytes
SHA-256: 7b715a78ba3e6e0c56cc722c8bb339e535aae07d6fbc8bcfac9a7f6664636698
font_02_sfnt_off00013345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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