Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec6011ae71b7e26…

MALICIOUS

PDF

93.5 KB Created: 2021-08-18 06:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 13a304dfb8d92ea7777b867ed37fae46 SHA-1: 17b4ffc3061aac30132e2863542942c398bb6889 SHA-256: aec6011ae71b7e262fcb3dec2c39ca507e4bbc0e5cf8d37ffea92f190d88f4b0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or exploit vulnerabilities. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://comtraining.cl/userfiles/files/74876207256.pdf In PDF document text
    • http://lasfyy.com/uploadfile/file/20210626103003003.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/2a8b4701aba5149ee2f1faccbabb756e/31465876755.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3a482f226baee2f0c832b021c5a8e649/sesoziluzitigoxubaletaju.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae2ad8f58---mawusagagamixiketojawiton.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/t8639fp4o1b6554dtt0ud1g373/gilafupoduja.pdfIn PDF document text
    • http://vlajamo.cz/images/file/dawumajuruxefapoxifuwek.pdfIn PDF document text
    • http://imi.vc/upload/files/gadupajamirinusili.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/baporanuse.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/fujonilikububiko.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff8d08912f---sufule.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/91775789325.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/lovedowubufepusimomu.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/niredukesaduxota.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/33858428732.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab20809b5---lodabugimorik.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/0vjkobqis0n8pehdrs8ekjcqr4/kasetitisiwuwulurasenabef.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/mobeaipsbf4rtshkbc4be8q4f6/vimiminebera.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/puh9v8g55mur55fcrg7jfkfej7/54322029162.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1af1981eb17fc7e926b8634a13277ca2/vevebutuvokuletizunal.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160742cd9b83f9---wovixi.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/904f4196681e518cd522dd43e9fc508b/31709538982.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16116dc808f524---60142781445.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2e0e8a5ac7ca5ae2054922130c79bb1c/didabisoji.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/35903829295.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b9g7peanetajfcd175hegvrg5/fobedijodowoluvuniwutili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cover+letter+sample+for+graduate+applicationPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 11160 bytes
SHA-256: 4716f09f5d93385ee9c1c74b429d521ba62911493172ee7c203fd4fff159498a
font_01_sfnt_off00012490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12490 16500 bytes
SHA-256: 8c88f10a6ed516983e5afa6325055be530636707cce9dbf461889820bc40d076
font_02_sfnt_off00014f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1