Malicious PDF — malware analysis report

Static analysis result for SHA-256 a058ad94da319b97…

MALICIOUS

PDF

72.7 KB Created: 2021-09-19 09:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e412433fae2b991ca2a762f5e5024baa SHA-1: 02a38ab1b9b784528646b961df0b39baf94ae06a SHA-256: a058ad94da319b9732fb776eaf82b0c96161e7dfc62bb49aa7da8cc1ec49ab50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs, many hosted on compromised CMS upload directories or disposable domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' points to links hosted on compromised WordPress sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://leaguengn.com/userfiles/file///kovimadudu.pdf In PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/jipizekewogiripidufefaji.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/85458124708.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/xijipifigewitefusex.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/lifelupugupo.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/fujibuja.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614618d90c485---9844948596.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/3076385758.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16136121eac610---47656773713.pdfIn PDF document text
    • http://topflexsports.com/uploads/begiwawaxoxukovoxegodiw.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/46197785626.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109071330215773.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/6831389167.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/7475206400.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/puduvukexurexekidefilepo.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/bizubin.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091800555873499.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///bepipudidunedofot.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/35837095741.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/zokojubosutel.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/39879314781.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613930131c48a---87007144277.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16304680030969.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d958d3afa5---73676264296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=redmi+note+8+pro+android+versionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DA 10828 bytes
SHA-256: 5e3ba5b6c1bddf0f98e18f93165ea26b6d873b027df098a7d4c0eec95215f355
font_02_sfnt_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 16504 bytes
SHA-256: 2f427462c66b0c3e659ac4cf7937ab42cf8cccff3cd29a4ab33f5f4854ddef68

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