Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c91e3a870874d4d…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 02:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b2d4e247690e9c40fdeca2341905550c SHA-1: 171fd272a9394c704d5823d1a588f5006819aaa1 SHA-256: 5c91e3a870874d4df61b28ef589a0db3130057dfcad8869e4ffea50d3c167e56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript stream further indicates malicious intent, likely to execute further malicious code or redirect the user. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 https://cructi.ru/uplcv?utm_term=miui+vs+funtouch+os PDF link annotation
    • https://0a3exp.com/upfiles/editor/files/sopozepunixoburasisal.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16140b14a9fb9f---18000315241.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/62374379141.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/gijurusupabim.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144173db0acc---tawiduvutunesaxozujagazi.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/86896275640.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/85133316342.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/88654965086.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/gatem.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/wowudalodusife.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/79716337148.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/pixitaniwiridikarovamig.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/bazelepunamovekesun.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/42297322923.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/20650051191.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/sijesijeduwezozodov.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/4920125879.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94b2ca033---taxugoxazejevasoxuvuwuw.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/61917116483.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/90083925034.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee587a4d0---45446145310.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/bakorudo.pdfIn PDF document text
    • 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_off0000cfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD9 18976 bytes
SHA-256: 5f87ad37b7b0b0bfe6588f36dbcc0f114553f00ef31bcd599665055560939f3b
font_01_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 10152 bytes
SHA-256: e67b538eeaea770d8abceee10d99eb3cf8dbfc9f4be42e09f6bb1250eb3d9429
font_02_sfnt_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1