Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fdf45edfad06b3…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 03:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b6c83debb28670cb50fe0c46ad745f4 SHA-1: 90604bb909cf3fa72c376113ea82405b4a534977 SHA-256: f1fdf45edfad06b39d15009e7e8521afcadce4d36e7f79aa8a45b894ce3392a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to improve search engine ranking for malicious content or to distribute phishing lures. The embedded JavaScript, combined with the link farm, suggests the PDF is designed to redirect users to malicious sites, potentially for phishing or to download further malware. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=modern+physics+experiments+pdf PDF link annotation
    • http://laulumaja.fi/ckfinder/userfiles/files/bozusofajifekudemimenome.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607002de16f29---namarokipobi.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7q2c3ptnd9lhb9qc707pv3aja4/wogefo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb96d2e64---56792851436.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1fda76d5d77ccbd3ee4706804ad81bf2/vuvuxasoku.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/fopitijol.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/birifekuputavutarerinito.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/1deb094be28c627a9a3f6027780161aa/53756385054.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0e4af1145---rojakivuvoman.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/66251819660.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/11c3af8b3cdfca320d8964cc60ca7be0/31592346661.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/065d7228181f82cbcc3f2bce1cadc9c1/80451726966.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/konuwozevumexirup.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/345b702fd3603d8d5e63aef06e675e7d/44397574116.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd0f32a528---zamupevar.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/wavemilunipatax.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/xanaberokuwolifulari.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/agsqcdeb0ul2bpujg23dn19dcj/31476386101.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/digoxep.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72107728177.pdfIn PDF document text
    • https://isleo.com/i_photos/file/37766367179.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/kofaruwarupujujuvu.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/rarasisumikakamudoviwizi.pdfIn PDF document text
    • 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_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 17796 bytes
SHA-256: 117ef8cf7c663c684d7cf93c4dca514a5161aa0c6a53e448dbc70b7b28934330
font_01_sfnt_off00010df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 10888 bytes
SHA-256: 0d172213193e527ad6b5050fa08dff7987102ae22f778d64a95ab9f3ba1e42fc
font_02_sfnt_off000126fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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