Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaaaac569519430e…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 05:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75dbfd7340cddc384823e5148cc247e1 SHA-1: 4936daee29c99cfc6648e0e1a42568ba73f8761d SHA-256: eaaaac569519430e470adb4477e27bed0d4eeee019c48723b20ee2b2979133af
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the execution of further malicious code or redirects the user to malicious sites, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=resident+evil+4+mod+apk+data PDF link annotation
    • http://vietkinggroup.com/uploads/userfiles/file/80281763287.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/52286596771.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/16874351840.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/22664591162.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/15501411990.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/23251011935.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed381d729d---velinupirevemilizufuxowu.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/jirazexemuxenabupera.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/67fd51d365f3a543e5ed1b8a9ae2118d/59948146097.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/12604021792.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/pifokarufitumovomajokoloj.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/modejibekidewopi.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/4177979592.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/52100828541.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/tekezata.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/wewidosawikituk.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kasonidelalisowisokez.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/funuputizuduruwuk.pdfIn PDF document text
    • http://www.bash.cl/media/file/nezojet.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/10077766461.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cfd4286670238770fa68f82f4ab2395a/mobuzomaxiposa.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210909002205.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b53aff4f4075b5f2add43e5489130c71/muludowegiwa.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/17447821896.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_off0000b1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FA 13764 bytes
SHA-256: 2b9c7e753ff67cc9f439862a673692523924b9d7bc843dc30c5d9f989dc341a9
font_02_sfnt_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 10732 bytes
SHA-256: 3ce089e6c86593e38866497f6c6eda4dd666c77f6576c4165a609044251c558d

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