Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b963fee9c8d135a…

MALICIOUS

PDF

87.3 KB Created: 2021-09-07 05:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 657ae0f9f40609ee5ea63d98b91e9d9b SHA-1: ee9123e1d170cd77651e82069fbedd03eef2417b SHA-256: 3b963fee9c8d135abc7469bdde8befd190c5abf03d3d766557a1227bf164ddb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff1ae19731---93983903239.pdf
    • https://nguyenhungstone.com/uploads/image/files/pebunomufajurerugokuroduf.pdf
    • https://panama4d.com/contents//files/mirobetugufib.pdf
    • http://talesma.com/E/file/bowalakotema.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfb382d2f5---monevisajipijerejazogag.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e904d490466---63469129763.pdf
    • http://hitecds.com/userfiles/file/pumutinudojojelesuzobufa.pdf
    • http://longbeach.ilovepokebar.com/uploads/files/bajisijenuzugapubavep.pdf
    • http://cn-biyoute.com/d/files/delejesekerogazubirizi.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/r58252sgmugj12s81g9drbngjc/wawukagi.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a665f3037de---wojitikorameluxofoxet.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/9af2274e76f861cc0ae16c05e2f97bb1/29764161328.pdf
    • https://aspaeng.com/files/image/files/gowomemik.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7f5c396c9ce6e71eca909f20da86d7db/vuropokobugomokedizi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b77361222---zalusasepuxesetinizife.pdf
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/c106c7470a52b3a9d46084323d355002/48922493887.pdf
    • https://autotrans911.com/thread/admin/uploads/file/kalezazokejawim.pdf
    • https://strongpointmarketing.net/userfiles/file/sajenosoporigite.pdf
    • https://vannordenvastgoed.nl/userfiles/file/51665752439.pdf
    • https://yukkumpulgroup1.com/contents/files/78679441496.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078146763c72---pebapivasebeson.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/pagokakazuzijabokonebigil.pdf
    • https://samowar.ch/upload/file/54239965524.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f5777bf76---dizuwenovon.pdf
    • http://francisfamilyreunion.net/clients/870293/File/zuvarifeba.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cierre+precoz+de+fontanela+anterior+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_off0000ee06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 16792 bytes
font_01_sfnt_off0001061d.bin
8a4ee3a4578cf6c3bf824243f05dc244c14e837dd4d4674f37652ef7c889806b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 10536 bytes
font_02_sfnt_off00011e41.bin
dc2a3bad35edfcb89b6a6a1ea619f75079af99884b352f6a77725fd302ebd73a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E41 19172 bytes