Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8091f6ac5ce354…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 02:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8cffa5a24d0b2a205d2431677b2351f SHA-1: cce09a61dfcff29762fd8645dc1f6b43e50a4295 SHA-256: 8c8091f6ac5ce354db602cdcaf09e9b4768cf39de7dd3955cc01735d5cbe91e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing lures or directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ketchas.ru/uplcv?utm_term=binomo+mod+apk+2021
    • https://aradmissions.com/ci/userfiles/files/falumotusovurosozitef.pdf
    • https://norservis.com/files/files/livatipidufer.pdf
    • http://greenglobepms.com/uploads/71271192084.pdf
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/vawiroparitifodewexe.pdf
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/11881581953.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/oad1f0t4r685gk35f2rlpva8ua/59595473394.pdf
    • http://avtosfera28.ru/userfiles/file/90980993948.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/vegawuxepogofodulik.pdf
    • https://koparieshorvathbusz.hu/files/file/bubitexewixalode.pdf
    • http://snieznik.pl/userfiles/file/gukedov.pdf
    • http://vietsaovang.com/uploads/userfiles/file/wotibafogiruduvudugof.pdf
    • https://flomogroup.com/upload/files/xudemaduj.pdf
    • http://achilleferolla.it/userfiles/files/nomatonoviwezapujatovas.pdf
    • https://mumegram.com/userfiles/file/gusuda.pdf
    • https://mehreganimaging.ir/images/upload/files/71037707930.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16146668492444---nazonaxogo.pdf
    • http://peoplefoster.com/pliki/60965183364.pdf
    • https://anna-bel.com/app/webroot/files/userfiles/files/91191091668.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/dc20eef88efb4c58a7398dcf9d358216/12119836346.pdf
    • https://firstview.christoff-design.com/files/xerowa.pdf
    • https://friendsofmultisport.com/ckfinder/userfiles/files/lemetabedopetigezup.pdf
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/sijefarawixipatuzuzul.pdf
    • http://sententtech.com/file_media/file_image/file/26826719952.pdf
    • http://vladekoservis.ru/files/56527205537.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_off0000ba65.bin
db2de0dafa88c3f17c716594cf3165c60ad17adc01d13a0478b626f4d9137a3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA65 10448 bytes
font_01_sfnt_off0000d219.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD219 16792 bytes
font_02_sfnt_off0000ea2b.bin
5878ca708461bba2911ea264f383ae023d5ff402f28d2248602ea95eaf4c55e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 18020 bytes