Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fa50048b1996cb…

MALICIOUS

PDF

88.4 KB Created: 2021-09-07 17:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 56a98e136147c061faf97dc530635d62 SHA-1: f47d6bc80a9c71af645a341a9c58133dc9e101e4 SHA-256: f5fa50048b1996cba025dd374fcb2ec5d4c0d6d6c6b302c294666b127c83eca5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7abd1e48d---gaxijojeloganetaragireriv.pdf In PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/49532936109.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc562201f2---84317772586.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e30f57a5b95---budasulu.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/pigama.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/welofubibujowasaj.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609609f5ef1cd---99934204108.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/fafezesaditinesosorudemu.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/12250189589.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612177f46648a---jipasegigegubelun.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/12052546826.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/90715916742.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/worivepagusevovilo.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/93872497695.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a0edd24e2b55476d856eeb37e4cb6e5/48646423093.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/34907342073.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071d87cc3955---denofizawemakamirot.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/a11f4afc5cfb1a55d983e7742a40a1b2/14666281044.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/gibijimu.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/57379145466.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c788386cfd5---divapolivofanivifoza.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161133372d56a1---forewusi.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/65206416424.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/23305285679.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/26983484068.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/73508b43c166915d67d3c76084b68e32/91500613761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=origine+des+marabouts+en+kabylie+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_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 11312 bytes
SHA-256: 2f48d4e5ce709697ecf64c584c5b40b6a732671b50669f5ab8947820b5f1c561
font_01_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 22148 bytes
SHA-256: 8600cdc7e113b340d44e419d42ccb24be91081817f0976ba43c067d955fbcdd6
font_02_sfnt_off00013b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1