Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b4b00b071718f5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 09:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca5ba0c870719b6509952f445354eb2a SHA-1: ec93ffdca5f5395c42ef3ae4469bda2262c7b09a SHA-256: 53b4b00b071718f5ca4de5d968c01f4b5fd4451a416c987688a4c756d651bd46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://brandiassociati.it/userfiles/file/taresesezajaxaxew.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e3039f02b---97984238363.pdf
    • http://vertracapital.com/uploads/files/notiperabajumurawuba.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084a957df7b9---tipusuxexoxiwusalegipe.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/56f1e2319025df9f5dad51cd0267a80e/xivejutikobedujedusiwuj.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097f2c19e273---64784193059.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/87854672029.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/87540871438.pdf
    • https://jpjplumbingandheating.com/FCKeditor/file/46394020868.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5e292d0d8---wapixerarob.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/l21t6glitpobcs0ni40bf4aj8c/9371769352.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/03hs9mhmi7hiher09pc99crsnj/jorivizuga.pdf
    • http://thietbianninh188.com/uploads/files/gufolabosikagamonopuxum.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/e0777d601b72c9fb0500295938a02144/xozanemodisuwiboxug.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8c4f433b6---molozukurenovaji.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073653678efe---jefoxuvojanitago.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/7dii5qnmajhr4u95j3mn6g30ba/18228886817.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c7715c15e5495bf17bee65b306ea39ee/3230493882.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16095f044d879f---modorizegitusuboxawonar.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/zujonapeve.pdf
    • http://volkshilfe-ktn.at/images/content/files/474585298.pdf
    • https://annekienlen.fr/imagesfile/paxarijepavanebaja.pdf
    • http://pressvaluation.net/userfiles/file/lazuwenedab.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a08108eb87e---juzuguvawutixolol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=between+shades+of+gray+pdf+espa%C3%B1ol
    • 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_off0000d955.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 16792 bytes
font_01_sfnt_off0000f167.bin
1de9389dbab574112b36c3cd2c1ac407a59111cf64c8c8c1d97c2fd85b399fee
pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 17744 bytes
font_02_sfnt_off00011fc7.bin
c815f9651a1931005fe6cc925df9e78db6add580441c0448874f46620e10a777
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC7 11144 bytes