Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f3925c3ed89d3b…

MALICIOUS

PDF

91.0 KB Created: 2021-07-19 17:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2bb64ca43c39f969843822e0756884c4 SHA-1: 1dfc0cac4e4fa37ae9a53c09729818856540c53e SHA-256: e8f3925c3ed89d3b35c7f00beba673eac0179da09bbcf10a02f824d67421e70b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM, indicating it contains links to potentially harmful external resources. The ML classifier and ClamAV also identified it as malicious. The numerous embedded URLs suggest an attempt to redirect the user to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4785feed70b9ddbf7037e0eae7c74c48/zugijonelapixiwulekek.pdf In PDF document text
    • http://roxburyhs1987.com/clients/63080/File/86748789931.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/mivupitulatoramex.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/edjbkeks4f3ojbhj74a21v8pu6/daritofevagoxezazar.pdfIn PDF document text
    • http://atek-ent.com/upload/file/xoxufevomadasakil.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160806d50d6f6c---31551418627.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/26697d7c3df84546ef8f63193151664c/55133179510.pdfIn PDF document text
    • http://bensonhigh67.com/clients/55910/File/74189353989.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16080d6ffe8f9e---xefararutoreduguwefobapu.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/91464994249.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/32165325029.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/f50d00ee09465e12c4697c6d941548f9/13884115746.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/25810046267.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/91063432223.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7592e30c7f---69476591192.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/firomam.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c354e90989---firomufopadogiku.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/9b5a11734f1944e1cf2a49f4dee92df0/zixod.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/nemovepipojileporomijo.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/jivafovuda.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d6193c0be---gajoxagedanejovebowamijuw.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccaa2e603f---43208621729.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/fezisojotubogafozotujekuz.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/36324001477.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/9826271070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=floating+camera+video+recorder+apkPDF 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_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 10824 bytes
SHA-256: f6cce0f1e0f9cc0577f06068ffa828121bb25a253a4e3695f01d78c2f62b0574
font_01_sfnt_off0000fe2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001163c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163C 20288 bytes
SHA-256: 001a7e35fdfd62aa80534a41ef3685587a45b649a4a99ef4aaf54996caa31012
font_03_sfnt_off00014895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14895 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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