Malicious PDF — malware analysis report

Static analysis result for SHA-256 df11b86420c76e23…

MALICIOUS

PDF

81.6 KB Created: 2021-07-23 01:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eff034cf0dee1bb6a2584e1a46747785 SHA-1: a1ea80a55f2463194ce7a2eb6095f7a8faddcc85 SHA-256: df11b86420c76e2360d956606a1771ca14811fe48934681e34c4086fab34608a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://comp-art.ru/userfiles/file/xobuna.pdf In PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b1350856a6b42e9796677d54e7960b97/26793961367.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072bfdea369b---70322541755.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096c1cfd1492---dikofuxikemevuvogabuwa.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c785f9c4f8---58224085503.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078676217c12---selisesozum.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/pufekisozinisoligawuler.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/lenagazitolanovuzaf.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/81942371774.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/26400604088.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160acd917417bf---tirej.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/52561568847.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2da4f752---lurige.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1e8a8089a---kifolupixakuje.pdfIn PDF document text
    • http://wwstationery.com/files/file/25680059166.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/11124024770.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d703dee7eee77dfc2f9a7e10295076dd/64323991027.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ttr4upj9an4jndduhad5t7ucdt/28397732294.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/21682319647.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ae01946d56bcc66f378366457e9e56f9/benizoza.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/13336546077.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/38475030525.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/35271009020.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/zoxozaluperekutijufovunu.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/22982529537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sheep+dissection+lab+answersPDF 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_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 16104 bytes
SHA-256: f1396df92ecf77d99c885a63d394b589d03bcaf1124e58a15b1b41e5924cde31
font_01_sfnt_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 10912 bytes
SHA-256: 097706abbf82868235808deb0f68eb0928f013befa34901fc812cd61b61580fe
font_02_sfnt_off00011e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1