Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdb9be1bc7a5b94…

MALICIOUS

PDF

94.6 KB Created: 2021-09-06 22:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b21814087ccc5d3bbafb7cd5c4729fd SHA-1: efbcd7f075103dc1e5ad31b644c9cb83ab0cb771 SHA-256: 9fdb9be1bc7a5b9452213e8cfc1f1d43a660bab3cd449054fc5838cc0efbd495
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it is a link farm hosted on compromised CMS uploads. The presence of embedded URLs and the 'download button' heuristic suggest a phishing or scam attempt to trick users into downloading further malicious content. No scripts were extracted, but the overall structure points to a malicious document designed for initial access via phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38d9085659---zutaxesudum.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/n50cqho432104ee1mddd91c3fj/18279161881.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e58b59cb0---kijalolusizopudekul.pdf
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/xuzepadotanuwi.pdf
    • http://manegedebuitenwijck.nl/uploads/file/37677738231.pdf
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/sidogevewobororasabotina.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe9caf7ce---44131378813.pdf
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/9464617304.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6f91fb0ca4020c4ed5a26326f9480264/95929787861.pdf
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/27600258129.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c5761efe0fbe971891e34259511207d6/39462980861.pdf
    • http://altiro.nl/home/tjerk/file/zujogufupok.pdf
    • http://kovofilm.cz/userfiles/file/6668419190.pdf
    • http://driver-jazda.pl/upload/file/34410811324.pdf
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/sazuxosabewodamusesaz.pdf
    • http://xpeedon.net/userfiles/file/20210902053800.pdf
    • http://novafish.it/userfiles/files/wifesupu.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c29321bcd3d---kebadusidobowevufimexi.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5335061d4---88865821654.pdf
    • http://sahrugs.com/userfiles/file/46690346564.pdf
    • http://inncredel.com/uploads/texotavevogala.pdf
    • http://ourhkg.com/UPFILE/userfiles/files/webaguleka.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/mf5tepjmc5o4qa514htke2oj62/motuviwadomejoril.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b687120635---96311094093.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/vawurofasuloxa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=amoeba+sisters+classification+answer+key+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a7c.bin
01945044bdd3f8f3a7ea9813ed1c689985b97135446d65108f0fd212cc7f66cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 18020 bytes
font_01_sfnt_off00013988.bin
171ee4069c491d2510afbb51cf0022cd5e2b5f9d1fced895991606e57c94e772
pdf-font-stream PDF embedded font (sfnt) at offset 0x13988 11192 bytes
font_02_sfnt_off0001539a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1539A 16792 bytes