Malicious PDF — malware analysis report

Static analysis result for SHA-256 4237b5dad4491d03…

MALICIOUS

PDF

77.5 KB Created: 2021-06-27 08:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 716a4973b2867ff6c93279b9834b69b7 SHA-1: 41e0cd9faa389280aa89a9c1fccedf5ae1fb3a0b SHA-256: 4237b5dad4491d03e51d9eeaaa0fbceb99a0307ec264f3cb14e416b0a3fa7245
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/mjss9eqbqv0aakvibof78kouf5/51734133539.pdf In PDF document text
    • http://zulaikhatextile.com/userfiles/files/52456330692.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/mubexovud.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zepinasonuxovakiwitaxu.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/sejaradoruz.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942d24d5204---53424013864.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/58rrgfocjrf9pht2qrfvna8jo1/91626313516.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/bopozirasi.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba75d3da6e3---rarafikosesimiso.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/39137238277.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ma4oi3nofpklejd8u1afkiebbk/94500210962.pdfIn PDF document text
    • http://blueyee.com/upload/file/170904195258.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/9k62oc7r8ire5gbkajcgvj72s7/refotetakaxo.pdfIn PDF document text
    • http://metapolar.hu/tmp/babiwokolirovomijafuv.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/13486616232.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e094d2355cfc2ecd04a1ebb34781e684/93755727562.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac552bac2---gijemupatikefakonorib.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2de85b0350---dibesinawavajekixogakorov.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/82ke9jr0oto5t8m5cj0ms63v2v/88142099680.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/2a39d36a62ae38c84962e766f5d0c2f5/72259538707.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/52323046518.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8d1900d3c---repekinogofiw.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/k26uoat3cllsc0ok96th7h89ig/dudegaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=partial+lung+lobectomy+dogPDF 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_off0000cce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE5 16544 bytes
SHA-256: 2a3f7f9fec3ad2aed8c4f3f99dcd973808440bd262bdfdb40807a8377fca160d
font_01_sfnt_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 10900 bytes
SHA-256: 2fe0626faa5efbc01dc5f541ccf6ef3a7707cc7a460e5c6f7edb694a9793bd32

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