Malicious PDF — malware analysis report

Static analysis result for SHA-256 527a408f1c1a9965…

MALICIOUS

PDF

103.4 KB Created: 2021-06-28 08:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f9f68f09cabac163e87b74fc761701b SHA-1: 522ae4fab590fc096d2797f0e259dc1f08a157a0 SHA-256: 527a408f1c1a99654bdeff16c43ef19966d857e7c6ed6d60210ed04c4920f69a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

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://aimhc.com/userfiles/file/82246475848.pdf In PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/dfc632e0542feab2fa96d983b72d50b7/99169238783.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f793hdhsbjqe0bkfrgujr4ivs9/45776881026.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/95027f0a6a421421b5b20e821d4b33f3/17822134995.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/46840655924.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f65083d538979a72bb88993377a5fd89/fevadesibewomil.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/zudalebanonido.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/189548281.pdfIn PDF document text
    • http://dienmattroigiasi.com/uploads/files/lexogotuwasaturepa.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/nufafobuwe.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/sezapipalebomegadawexup.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f76a643e70---segasojes.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4f5482d1---28135510144.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4807ee6a6---84966276492.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/23178173000.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/u6krnsrj06v6qfpel79h99tsp3/xojilezi.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/46655263381.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f2362e6f2---motosele.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/56447754411.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/96710584053.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tidozebon.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/75701033785.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/nexozakawemewotusorur.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/tumunafaropu.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/2hha16m9sj9dobv26i928tmpml/44953624053.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/cr9eds6ief3ou2dso68l7guvdl/65544760126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+attack+in+cocPDF 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_off00011dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D9 9944 bytes
SHA-256: be271ca540ca8e6bc087aeb4abc77ea54b3bde7d15ee74a2883ab6220f6f3229
font_02_sfnt_off00014bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFB 17868 bytes
SHA-256: 76d2002bd8cfe07d48b45ea4a51d953528b33e1d2f6aab3e4ac96df1c6ae3c8b
font_03_sfnt_off00017af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AF8 5628 bytes
SHA-256: 6e9dacd45dc45315531dce8be30e617a33d377e4bedced8818cca611daf7fcb5