Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f23886db58259cb…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 17:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b834a96edca93e14f15da6251cf202e1 SHA-1: 58651c7fc6d8f5618a4b6920b9ce6ade71504930 SHA-256: 4f23886db58259cb818644c66f168f7bfc3c1aec33d98aafc4c63d5d289a36f5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous websites, many of which appear to be compromised WordPress installations, suggesting an attempt to lure users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection as a Trojan indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2d1f50acf---vodoxavisadofizu.pdf In PDF document text
    • https://cahayamimpi1.com/contents//files/rewekosuvenefozutafaxo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160805fd28e122---44792981796.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/11114798097.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/vigijegunagotizide.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abd2757253f---dipavanemapibir.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/lanexunafajof.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/bonopid.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/3teb1qmk6k0nnveh3aucl35bl6/jopopesiziparoketevur.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/64675842794.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16123c8e486532---fogodazum.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ac7750a90---kofoziwodenugi.pdfIn PDF document text
    • http://alcantara.cz/data/file/sezopomerafiwuwib.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/95544314929.pdfIn PDF document text
    • http://aimic.com/userfiles/file/juwunodikazuguduwitixori.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/98608518065.pdfIn PDF document text
    • http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/dusalidenazejokami.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/8293154811.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160987ab45baaa---62601875000.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/wanetukaki.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610786ed27fad---nozopetubakivomu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/50559680bb438e46e2b0488a2aaf1b58/14051508960.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c778636b2d---gerurupum.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/64351882420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=latent+variable+models+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_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 10824 bytes
SHA-256: 889dff64374392b776e9a010f17df155a85d5427f6f2a4acd38fb3299d46e125
font_01_sfnt_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 18904 bytes
SHA-256: 30224adfcb309a304e4a17db9ae9c631a70c85f144a83352b1ea587bb112adb7

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