Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f10674070b608f7…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 20:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d0f51262f35c39459276fcbc72be617f SHA-1: be622f8340ce5e531e9723609e5121dc888f81e7 SHA-256: 2f10674070b608f77d51f056964203e4562b6748e9e0018a8e8f918a29d3fdac
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to obscure malicious destinations. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the heuristic findings strongly suggest the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/44fbdd69298a77cf8535e283dcef75d5/7749324675.pdf In PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/xajikirew.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/38910304799.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/60482228916.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/56569857067.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa2307ce7e---2694003891.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/69513131231.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd4231ded---88416485036.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/zekimumukivalesud.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/48761647633.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/lafajirivefewid.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c170a93b4---ligasapew.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/jaderudelotesere.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89f500c42d---61539613324.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/4233747813.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/28242211662.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/samuduzevedotajonowutaraz.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/28886975516.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/38681573398.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114af95d8c88---83493827159.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/kofalabodub.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/dewetagozuba.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/66900827052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pull+off+adhesion+test+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_off0000ce6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6D 10596 bytes
SHA-256: 3852d066bec5f4d37fd5392e46e5bfe48a1c94eef228a5a80fc96f50579841c1
font_01_sfnt_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA3 17848 bytes
SHA-256: ac8565442d8d0d29355af6d36e7c8d63b5360303c14f6772be1d8892c43998c5