Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c0acac88ff0770…

MALICIOUS

PDF

81.1 KB Created: 2021-08-03 16:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3af6b0090b6bf652f2dda21ce219bf54 SHA-1: 4f8f2f9ec8501980e4de605ef7d27bbac2575d1c SHA-256: 65c0acac88ff0770f996bb037a8dbc4617968759ae9a662c4d95a6f30ea013e7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics further supports the redirection pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6314

Heuristics 5

  • 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
  • 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://smidgel.ru/uplcv?utm_term=what+is+the+cribriform+plate+called PDF link annotation
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/2446327306.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a343167fd85---1277090200.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/nabekiparagamobi.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/11352339207.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/19800114573.pdfIn PDF document text
    • http://waypl.pl/upload/File/29115562384.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc8935794---43470584428.pdfIn PDF document text
    • http://canoeing.by/pics/files/23639916505.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/lesuzinuxamotivagipuw.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c9bdd1f49---47582273881.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609650d102c4c---gasimavemudibego.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/313f1d8809c3917b9b6c09d454e953ca/jebupi.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/p5cfk7h5m1bfcts5g4tuilt32e/sizajufororiwabedijajesuf.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d37fdc47c---kozusodojanatak.pdfIn PDF document text
    • http://huimao.com/upload/66790510726.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/bolibubuwixomabened.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/298e8077063202fc917825bed04a068c/2126598165.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/fetokizubuzara.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076d5c6593ef---50524796447.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/mabixupevawatusid.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2c89d052d6c2ebe89a893f214ab6812/vokenijim.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/46570954659.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102e1b888c92---dufakuwerupipos.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a32bb187---jotimajunugovudefu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 10916 bytes
SHA-256: 1b0a46e8b68b50191b253da884c2a0402a73502db02efea54bcaddaf00914469
font_01_sfnt_off000110a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1