Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea8a84582d6b411…

MALICIOUS

PDF

111.4 KB Created: 2021-06-28 04:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 17f7b7a10e0e21710100e54da8294956 SHA-1: 3d5ef0a48b994af33c6ca0ef932292e502bf205a SHA-256: dea8a84582d6b411b088a94e5dc413663e9b1abdf4985a8b51be15ddf1e19368
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of a link farm pointing to compromised WordPress upload storage and disposable hosting further supports a malicious purpose, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection or payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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 http://www.css-jp.com/upfile/files/2021/06/09/95369157855.pdf In PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6f8e08a9---lezejejujubabezudatesem.pdfIn PDF document text
    • https://patc.fr/imagesfile/falojiwekewojujasu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913ad38e581---vakubikifesatiwizikenezob.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851f8fc22d8---jewimopuwikojurabeba.pdfIn PDF document text
    • http://momsystem.ru/public/file/48408741139.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/0b0de39d5f3b13d883b2b781c29e991f/gepegapaveruxalomefe.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/62181418034.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/24/file/20210524_220238_113.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/65019751958.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781c84e1272---28468894814.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///74982846922.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/012e14a7c04785143717fe0fb4578e72/32470858695.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c5ef662db43bee315d4a30b967ee750e/vizewolesixarule.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/58054042697.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/16545872753.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077803e83b89---74618542366.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/347b9b8f2e52ff59c0ac061bca6aaf98/1666314072.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7b51e0a62bc09ac59e5ee940c0ee9739/51720862211.pdfIn PDF document text
    • https://stopserv.ru/files/file/toxugenukosona.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160798289857da---10196022962.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/05235acdeb04d889dfbe0d14f0faf7a8/kufefodigasubufoxokoliral.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/mopilus.pdfIn PDF document text
    • https://service-panev.com/userfiles/38787670076.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/95502014192.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/resemubizukuzokugowus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=icd+10+code+for+right+hand+swellingPDF 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_off00015019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001682b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1682B 17776 bytes
SHA-256: d0ef1bfeb930319d7c6da9f84adeb931170a69396b3dfaecdceef0e39719db6f
font_02_sfnt_off00019690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19690 10968 bytes
SHA-256: 65a6386653747b765d57a845446849139e63d69f8a5005ad1514c9794dd5d3d4

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