Malicious PDF — malware analysis report

Static analysis result for SHA-256 c659f4fb8dcc6218…

MALICIOUS

PDF

90.9 KB Created: 2021-07-09 10:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fac1dd1435a08522015d6c6741900129 SHA-1: 6699b8edfd873d663ebc4eae101acb0fb019ef1b SHA-256: c659f4fb8dcc6218f545326ec7317fc3e67119f7cba0ce575ccfa9e465fd3fd8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links are likely intended to lure users into phishing scams or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://chcial.ru/uplcv?utm_term=real+time+with+bill+maher+megyn+kelly
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b46b0a5a2---25148469156.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d26882709---41056296791.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606fadae5f292---tapamab.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd309b3a2c---28672378928.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/av3s729sms1i5l4gc3dd5b6l78/wadezijinetebigusasajurin.pdf
    • http://wsm.hk/images/uploadfiles/file/visudalewusufekov.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160926cdb83512---jupuz.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bf3dbd67f---boteba.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3cb3618d4---durazemupulovawu.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4043c9058---32484680845.pdf
    • https://recapress.com/ckfinder/userfiles/files/vukaketepumupipuzi.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2005dbeb6---37460410386.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cc3d045f2---2551312457.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/48f0ee0bec744af110eb44e7d486a132/wobewinawepemekulekotoz.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16084079d67f93---febapibuzeludebixi.pdf
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/15495967423.pdf
    • https://al-wesam.com/userfiles/files/tijezirulisa.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2548d33450bdf5580774d99a156bb452/10636583138.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/70395333547.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160848d5e60843---61668151945.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502043222749164.pdf
    • http://okmarin.ru/userfiles/file/53677677347.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/sg4tc10abe122qhmd0ocsggikq/44933085809.pdf
    • http://igabana.com/upfolder/e/files/20210623021231.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_off0000feb0.bin
201679cbfc3d911f29796f1883a053b3fed26b7a459a4828f5cd479322bf0367		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 10744 bytes
font_01_sfnt_off0001172e.bin
b69da035e887550bd3916ebaaa1751ed401af997234b17c41bbdde3a247c3754		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1172E 17884 bytes
font_02_sfnt_off00014619.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14619 16792 bytes

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