Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76c9ff0c2f14dc9…

MALICIOUS

PDF

92.5 KB Created: 2021-09-23 15:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6c70717e60d23e8271c10e0bb95e7fe SHA-1: b6da6457d042ea465ae38071da165c90cd0341ce SHA-256: c76c9ff0c2f14dc9a3b4f49f15715c70697337f3edbd20ea674c2df265f510da
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The primary attack pattern involves luring users to these sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.saletime.gr/admin/fckfiles/file/14430179457.pdf In PDF document text
    • https://kampusogrenciyurdu.com/file/99347262287.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/jobod.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/viketejip.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210909172246_2099082502.pdfIn PDF document text
    • https://viceda.com/userfiles/file/83003994326.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/051d67205e5bbb9480b36c73030c496a/pusixopu.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161474a9360d35---bimorafososi.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/sujedibitakanemefajaja.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/seruwiduxunoz.pdfIn PDF document text
    • http://contua.org/userfiles/file/79418184455.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/9252913423.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/marubarijifemadivovakas.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/davodudifalisi.pdfIn PDF document text
    • https://masukpt1.com/contents/files/41423229808.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210913074443_y7fyz4.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/52809008753.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/tikizewukalejagej.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/lagavu.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/6484287577.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16137f54b0852a---21792691361.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/xuxojanimedi.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/lurejuxanabokowu.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/93142040406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=is+save+the+world+free+2020PDF 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_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 17056 bytes
SHA-256: 22e5aef98d63ebf5ca46665fe24d8b8c1735da1149b45972ecb93fcdfab3beb9
font_01_sfnt_off000133b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B3 10600 bytes
SHA-256: ccf92b7976adc6df6fdc970a8b66d5d941272903a053584ddf4473c6edc5361d
font_02_sfnt_off00014c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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