Malicious PDF — malware analysis report

Static analysis result for SHA-256 1667ea3ef6d703bd…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 07:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 17b5fd7d989f182f2e3ee17a7ac8f437 SHA-1: 5e14a67f05211655d51713fb6c8f56996695ab70 SHA-256: 1667ea3ef6d703bd96338faab0f43cc10024d4b39b2043213f1d875123f22b7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The presence of multiple links pointing to compromised WordPress upload storage and other disposable hosting suggests a link farm designed to redirect users to malicious content or facilitate the download of further payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ebrinteractive.com/userfiles/file/80716286447.pdf In PDF document text
    • https://rcot.org/userfiles/file/23651262625.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c0c73d25c---75458605021.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/tadivufimezovugabe.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/6752748345.pdfIn PDF document text
    • http://indexone.ru/upload/file/redivonebunufivasufavutur.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/dokuzolazis.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b324b6bfa---72614522468.pdfIn PDF document text
    • http://terrietanaka.com/library/files/75701883965.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8652ef85c---7916698669.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d7ebcfa12be6ea2a5b04346d08909fd0/xosonoduweratowijoxeman.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/d4f9361281902d97f3a8487828fd813b/bebedokinirufupif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c733c2f138f---rikovik.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/87826520978.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db9a20b4d---kafixogewakifamadavut.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/lazuzijusuwedabakov.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/fexavelesimazufixide.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9439555ce---gaganuwanofunuxoxuguj.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728d2de36b2---satolodatedowe.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/xuvavaxikejabenaxilipajo.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/35569073434.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/xitarufisovetabowuvig.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/1d59bd9a891438decdf59cf33fadd86e/34236658613.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eabdd6c6c---mezilewumesamabi.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/44306bd8416d7bb782c63cb1d83ed463/dujarajetol.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/fetokotabotusukat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=halfway+crooks+meaningPDF 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_off0000ead6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 19232 bytes
SHA-256: dc5384d3a6a6d2096b012295cb84a93ee1d8b930e119c5a6bb6521e8289c5844
font_01_sfnt_off00011c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 10864 bytes
SHA-256: 0a216752df5a69a59c15796a16a95f219414eb2248c45a78db98728d9bf951d3
font_02_sfnt_off0001353e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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