Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ce186f7ba8ae47…

MALICIOUS

PDF

86.6 KB Created: 2021-09-05 08:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a8b8db87bd4267a3794a4ce18027626b SHA-1: 7b35ebd4b582ceea841a574b50a221315105f879 SHA-256: 61ce186f7ba8ae474bf535774900b04558bfdf582d95f58fa106de8ee57bd488
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=language+program+and+policies+in+the+philippines+pdf PDF link annotation
    • http://sobinco.cz/ckfinder/userfiles/files/32193943686.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963faf7a5c4---84397267597.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/vodapideleg.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/25346283043.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/0ab3780d659acd9632470e1f6525b3ac/vixojexedo.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/vawitutamipodi.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4833e630abf107e33b64fbf3b16f4780/xavemupifanumekijazikepo.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/dobewop.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/7912870393.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/parikimoxuwex.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56b7638a0d---nogukumiras.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/5h380prbhargjjhus535u586qv/tedevugej.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a3f75eb89---28632879957.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/6697004082.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff20984138---rexewezineru.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/71416151007.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/63242274246.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/fejimidatelupe.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/26350114714.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/jjoq6qqed2rvr7phfh1cvfobd4/61603793318.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/31420283516.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/1f103fea045219f362c10dc0cf43ee34/xofovexafofozuranexuni.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/387869d31d93b43118491fcea6e0ca3a/51019947633.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_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 17744 bytes
SHA-256: 4396b389bfac8f7a0457c44015860ced6c271e69fb39a573cf6a6b9a9485694b
font_01_sfnt_off00011add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADD 11124 bytes
SHA-256: 06be1665661a2ff5efdd1f0e8e5308370401155414a7e480d1e20b28f2568ea8
font_02_sfnt_off00013464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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