Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4210d0edf78ab10…

MALICIOUS

PDF

82.3 KB Created: 2021-10-07 14:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 68e8504e94b603c60bfb3d5ef9b3c7c9 SHA-1: 1b05010503c228b65119b822032e75d99d75a9d7 SHA-256: e4210d0edf78ab10dc047081b06deff3af4263fbc1ffb288b9b40d0ca84e4ae4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS platforms, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further compromise. The primary attack pattern observed is the use of a link farm to distribute traffic across multiple sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rafaela-motores.com/userfiles/file/nonizefajelugumevigi.pdf In PDF document text
    • https://villamishkan.com/310renonew/front/images/files/viletedejufiku.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348000b7c89---96578889974.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aded2ac04---nokusutirezexobude.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/38868764945.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/tuzakowaz.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/lirulizimijunezexudefo.pdfIn PDF document text
    • https://matratva.in/userfiles/file/22203963660.pdfIn PDF document text
    • http://spakimthi.com/upload/files/66771091253.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/35358945161.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/11859048671.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/44164487966.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/sabotozazin.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/37350028339.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/37023244480.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614e73204ea9b---givezagimavukufidasebof.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u9kf2b1jqbg2om3rlki6s9elh5/96030424043.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/83639625268.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/451518806.pdfIn PDF document text
    • http://atomleasing.ru/media/File/55833642988.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///bomobajejanub.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a4517ce74e---60518583366.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8cf7ce36---migipetokif.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/23420415711.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/cf29708eda08cc012538274775831744/laxoterimaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=p051b+2017+ford+fusionPDF 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_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 10628 bytes
SHA-256: b1872914b66c37a8aaa4d06d23ab473e12a5e875b172c0a65b1a81011fbd09f1
font_01_sfnt_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B92 18680 bytes
SHA-256: 214cc93c8af2c3b7a32fba383a41fab75685aa1fb9619dc299d8a8a312371b56

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