Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e523ea814f1133f…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 06:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2b12090d89781ad5a492e1eeeb389e27 SHA-1: a7a1a8f8445da3ba4e6baf8a15c5fbc0d7a46b0b SHA-256: 2e523ea814f1133f67c069fae959d896d940c17799dc562d75f303be4fec4394
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/75995215323.pdf In PDF document text
    • https://hyundainhapkhau.vn/upload/files/8480284022.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/30732467742.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/xofob.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/nujiwi.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/zixajonavexuguwavage.pdfIn PDF document text
    • https://tebra.si/userfiles/file/87103151679.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/53142858885.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/jiwalugofiwuguzixu.pdfIn PDF document text
    • http://feg.vn/uploads/files/tiwalowavipevuporul.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/fukusunokeravawiwovoxaza.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210912024935_978848913.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/hi7rssj1djchs0mglumeg8j18n/53053511537.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/78772762138.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/zadejotozosigalidivupudu.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/32647140244.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/nisekizipodexeziw.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/zufefazinuxolej.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/22735847202.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/68528221738.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/wivepudo.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/balapamolopubabi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff9548f765---bakeditow.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/56509992471.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/83695910624.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/risakemunixawafefila.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613219e0203bb---25873761513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+go+spoofing+2021+androidPDF 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_off0000b5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EF 16016 bytes
SHA-256: 5d42d98a9b69efc76729eefa764a13694e8da0d7624153185e23433cb6ff025c
font_01_sfnt_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 11084 bytes
SHA-256: f7d9d087b49b75258fe9516018bba06a6a99129708c6f28a836db1a648dea41d
font_02_sfnt_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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