Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f00d4a1d9666bbb…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 22:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04d00d25dc02999196f95d1fed218794 SHA-1: b2567fe814615bbe7a42d5938c66ecacd21f38fa SHA-256: 7f00d4a1d9666bbb339390a36146da8f0f3467874de71ea97214758e10e24b0e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://birons.net/wp-content/plugins/super-forms/uploads/php/files/1e790f024c00115d301d6a9cfb396da8/vitikulajojusu.pdf In PDF document text
    • http://rayanchem.com/d/files/23705999693.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/46609098924.pdfIn PDF document text
    • http://apple888.vn/luutru/files/wexuxoxadunimexerox.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/sowowigagitisabodi.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/43102278.pdfIn PDF document text
    • http://guchen.ru/d/files/xibekaxanonafogibuma.pdfIn PDF document text
    • http://fullx.net/files/gukamidixuboz.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/pexurop.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332bb57f3c9---8901194328.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/402001_lirodituxik.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/rimelowati.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/20570875345.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/xumopu.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614087789769f---duleketibowigumenir.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/lasobalelekazifu.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/fazusetiligub.pdfIn PDF document text
    • http://3q1p.com/upload/file/210917042812108046ullmd6xyxx2y.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/67356343703.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/12444917012.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/mapuvopelokowiditimesipiw.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/wofexiji.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/58347629376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=shadow+fight+2+2013+mod+apk+download+special+editionPDF 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_off0000bb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB86 20108 bytes
SHA-256: 17a99ec268208ac9b6bf8e7f1edf019ad28c792d4884a79a426efc9f9a8bd9ec
font_01_sfnt_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off00010512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D29 11688 bytes
SHA-256: c2f7251eaf6e594888e8026beda37057a80fa03d3af06f298ea278f3162ce182

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