Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9440df93efb663…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 02:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c60589bd9bdf2bd143142cb3444eff2b SHA-1: d87a08136b4482806f077697f5452727287e098a SHA-256: ad9440df93efb66391186d4157d2b71bb4e40525efa47024a8d9cb573056d26d
164 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=medal+of+honor+mobile+apk PDF link annotation
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/86615192085.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/tivilorovabo.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/bavivedebilupajo.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/tiwanujoleromororuva.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/99243329516.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/bogofi.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a67cb4e83---3463818014.pdfIn PDF document text
    • http://koddous.com/userfiles/file/fikowijagim.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/zegamadopaviruxu.pdfIn PDF document text
    • https://tcremich.lu/files/files/xiribup.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/20988756887.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/kizuropifuk.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2352d340---17052616807.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/kigepaliwifutifosixafixi.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/lipobajozifubupewunupat.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/kimade.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/titazudalofos.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/74417221086.pdfIn PDF document text
    • http://jfe.hk/userfiles/43470412863.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210908_032933_113.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/sepesosevunosugimibuge.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161377cc3c8884---tiwibipiwag.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/48066014800.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/43307780625.pdfIn PDF document text
    • 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_off0000cb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB84 18328 bytes
SHA-256: e682d78da33463d6b3b069c3a5c6d034be814ab6de0d0ed2e43aee35630d6b46
font_01_sfnt_off0000fad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 10720 bytes
SHA-256: 75c0bd6e9b37217b93d16873edd14ae05672507536b14dedfd904e119c973362

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