Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea7375cf20ecbb2…

MALICIOUS

PDF

90.3 KB Created: 2021-08-13 12:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b69b3ae8ca7255627fb9789e295f0abf SHA-1: aa424ba8a5f4cdac33d87bc1efd852564c1df723 SHA-256: dea7375cf20ecbb2904a13d29eb018c3a14d35e37c09520b8155cfe7e15da1d5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://mu-rrrc.com/userfiles/file/pizet.pdf In PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/s13mt06gns3jma4p78j3namgdk/bunoravurafikuzusajojifi.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/liwojarodimig.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/3568311023.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/vudawibefuvibujekijegemon.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///nominodupozapa.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2935db96de---genoxupuwus.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b92c2003879d19d4487ad52e53c9d37b/27563043903.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/potbjbg86qo7cp467tmpp592d1/48253896896.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607349f3e5021---61789006193.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160982a54ab9d9---ruzita.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/jenivivezuje.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/dozobopovenejovixov.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/72460441241.pdfIn PDF document text
    • http://geodez.com/pliki/file/narofexevaresakepufires.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2c501f678b1efc5ad6c43a37ae6ecc36/60709522454.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/kujug.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/kapazebipikipuganujeb.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/levobudobegole.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6rruhqu7sla13qnbnbpfeav4j2/844019532.pdfIn PDF document text
    • http://hawkins-kearney.com/clients/f/fa/fa1934e8f236f3272fb98c88546bd003/File/26675469850.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/69826595296.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/b0vmi6ar78irb2bjaimadam0ep/kitovore.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/84468335719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+hard+is+the+nha+phlebotomy+testPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 17244 bytes
SHA-256: 7ec568253a7d882a0a5aa6321bf339c7e00aaf99e313778c4a11e9a0448b4b1a
font_01_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 10988 bytes
SHA-256: 563f15f633627499af9f2cbc243bfa0c5ba92f160ae92e1c5acdfe547702b435
font_02_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF3 17700 bytes
SHA-256: 2f8249d796ea94e11ea4f137bc508dcbd9f0d6cb3c3180f1f54316e6db81b841

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